I currently own the universal Westone UM3X, and I am very impressed with them, but there is always that nagging feeling that I could do better. The logical step is to go down the custom route, such as the Westone ES5 or the Unique Melody Miracle (both very highly thought of).
The main drawbacks are that I can’t test them before I buy them, and if I don’t like them, it is going to be a very expensive mistake. They are around the $1000 mark, and as they are custom made, there will be no chance of reselling them.
I would be interested in hearing the opinions of those who have gone from universals to custom; or, indeed, anyone who has any thoughts about this.