The VT Pro and the Aeris Elite are the exact same units with different names slapped on them. In the early days, they had a few issues with signal cut out, failures, etc... But it really seems as if that was corrected pretty quickly as we haven't had any problems with them in the last 8 months. They have great displays, easy to use, and packed with features.
The only real complaint I hear is the darn wrist straps are too long, but you can replace it with one of the standard watch straps for about 12 bucks. (In fact I've had a few people order them that way... it's easier for us since we have the watch tools to easily remove and replace the pins). Or run it on one of their retractors is nice, but otherwise, you can wear the wrist strap around your leg! They do that in case you have huge arms and wear a dry suit... but for everyone else, it's a bit much. You can also just cut the plastic strap down to size.