Well, I have a Tivo (I’m not sure what Showstopper is, I’m guessing it’s another manufacturer’s vesrsion of ReplayTV), and I can tell you a bit about it. Tivo is like ReplayTV, although the fee structure is a bit different.
Tivo units are available in:
15 hours (discontinued)
20 hours (discontinued)
30 hours
60 hours
That means they hold that many hours worth of programming at the lowest (basic) quality level. As you increase quality, obviously the amount of potential recording time is decreased. Unfortunately, since all these units use fixed bitrate recording, no matter what you’re recording it still takes up the same amount of space. So, for example, a recording of a debate, which would compress fairly well using a variable bitrate because there’s not much movement, takes up just as much space as a recording of an action movie or a football game, where there is lots of movement. However, you can take into account what type of programming you’re recording and choose the quality accordingly. I use normal mode (one up from basic) for most things because for most of the stuff I time shift picture quality really isn’t that critical. However, I found basic quality unbearable - digital artifacts whenever there’s any motion at all. For movies or programs that I plan on archiving to video tape, I use a higher setting.
As shows age, the Tivo deletes them to make room for newer shows. You can mark shows to be kept forever, or until a specific date. Also, as you watch them you have the option of deleting or saving them.
The purchase price of the Tivo does not include the subscription, which is $10 a month or $200 lifetime (transferable to a different user if you sell it, but not to a different unit, unless it’s exchanged under warranty). The idea of the subscription is that it will find shows even if their time changes (there are other advantages as well). You can use it without the subscription but you’ll have to program it like a VCR (i.e. give every program you want to watch start and end times). There’s a $100 rebate that’s valid until the end of this year, good if you buy the lifetime subscription. The ReplayTV’s purchase price includes the program guide. The program guide is downloaded via a local phone number a couple of times a week; it happens in the middle of the night and is intelligent enough to check the phone line to ensure that it’s free before dialing.
I love this thing; one of my favorite features is the ability to come into a program that’s been recording for 15 minutes or so and still start watching from the very beginning, while it’s still being recorded. Another great feature is that it gives you a listing of every show it currently has stored, so you don’t have to watch them sequentially (like a VCR with time shifting), and you don’t need to swap tapes. And there’s no limit (except for disk space) to the number of programs you can record. It also has the feature (which I don’t use) of finding shows that are similar to the ones that you already record; it has thumbs up/thumbs down buttons on the remote to let the Tivo know if you like the shows it picked for you. This feature can be disabled. If you use it, the shows that Tivo picks are deleted first, so you don’t need to worry about it using up disk space on shows you don’t plan on watching.
A couple of disadvantages are the price (although there are a lot of discounts, mine ended up costing over $500, explained below), and the fact that if you want to archive a bunch of shows to tape (say, all of your Simpsons episodes) you have to do it one show at a time. There’s no way to tell it to run one show after another - at the end of each show it always brings you back to the main menu. This, unfortunately, is not fixed in software version 2.0, which is due out early next year (the new software is automatically downloaded to the machine when it becomes available). There’s also no commercial advance (it does have 3 speeds of fast forward), which I believe ReplayTV may have (or at least an automatic 1 minute skip).
These units use the IBM/Motorola PowerPC architecture and run a modified form of Linux. This means that they are very hackable. The only hack that I’ve done (and the one that’s the most popular) is to install a second hard drive (i used a 60GB IDE, but you can go up to 80GB, the maximum currently available) which increased my capacity to 100 hours from 30. This cost less than purchasing a new 60 hour unit. However, it still ended up to be fairly expensive:
Tivo unit - about $230 from Mercata.com, after discount
Subscription: $200
Add’l hard drive $200
Rebate -$100
Total $530
For more information, the best place to go would be to the Tivo forum: http://www.avsforum.com/ubbcgitivo/Ultimate.cgi
There’s also a ReplayTV/Showstopper Forum, that you can get to from here. I’d say judging by the number of posts, the Tivo is a lot more popular (4 times as many). There’s also a much larger hacking community dedicated towards it.
If you have DirectTV, there’s also a product called DirecTivo, which will record digitally directly off the satellite (it replaces the satellite box). You can get more info on the Tivo products at http://www.tivo.com/
Hope this helps.