Keeps me fit
I purchased my 5.37 in Jan 2011 and I have used it faithfully about 5 times/week since getting it installed. I'm using it to keep fit after losing 80 lbs using the LoseIt! app on my iPod.
Overall, I'm quite pleased with my purchase. I think that having a machine in the house makes a huge difference in getting exercise regularly---it just makes getting down there and doing it much easier (compared to a trip to the gym). The Precor is also a much much better machine than the one I replaced (the electronics gave out on that one). It is rock solid, smooth and the ramp/resistance settings allow for any number of workout types. The thing is built like a tank---I only hope I never have to get it back out of the house!
There are some features on the 5.37 that I don't use as much as I thought I would. I don't convert the arms much. I also thought I would use my own programs more, but I've ended up just sticking with a couple of favorites (gluteal, x-train and hill climb). I like the variety and difficulty of those programs and haven't seen the need to make up my own. And I don't use some of the metrics as much as I thought I would. I probably could have gotten the 5.35 and been happy.
My only small quibble with the machine is that I wish that amount of time you could pause a routine was user-settable (instead of being fixed at 10 minutes). I like to step off the machine for other exercise routines and it would be nice to be able to pick back up where I left off when I get back on the elliptical.