Drive HQ - good, bad, ugly?

I’m fumbling around with the start-up of a consulting business I run from my home. I’ve always got a number of large files I need to transfer back and forth to my clients. Files that are too large to email in most cases, but I need that kind of speed of delivery. A friend suggested Drive HQ. I’d love to hear any thoughts from the Dopers who might have used it.

Thanks

-rainy