Well halfway through AFF I realized that I hate the standard mechanical altimeters and decided to get the Viso. I don't have a ton of experience with altimeters, but I think it's a very good product. Very easy to read and accurate as far as altitude goes. The logging is pretty basic, but provides all the info one would usually want.
Only downsides are the supplied mounting strap is horrible and I had to butcher it just to get it mounted properly and the strap is already coming apart after 15 jumps. Also the speedometer isn't very accurate, but that was to be expected for a hand-mounted altimeter, I don't pay attention to that anyway, but some people might.