I think there were display problems with some of the earliest Liquivisions. We've had none. There were also problems with the pressure sensors on the first ones; they changed sensors and doubled them, and that's no longer an issue. I love my X1. Putting it in one of Tobin's boots means no issues with losing it. The bright screen can really be read by your buddy, and the ability to change font size is really nice. The battery, if the gauge is not left in the wet tub, will actually last for several days of diving. The VPM software generates profiles that are reasonable and, although not identical to my RD profiles, are always satisfied by them.
I have an occasional problem with the tap interface in the water, most notably with gas switches, but it would be less of a problem if I weren't trying to gas switch my computer on the QT so my buddy won't notice me doing it
The only thing I don't like about the X1 is the logging software, which is very primitive. I solved that by buying Divinglog from the German fellow. You can export X1 files to this program, although you have to convert their format, and for whatever reason, Ross's program only allows you to do that ONE DIVE AT A TIME. So keep up on your dive logging, or you'll have a bunch of tedious work to do!