I've had my Tablo for just over a year now, and once the stability issues were resolved, have been extremely pleased. I have to say that I value stability above all else, so even if no new features were added, as long as they don't break what I now have in a future update, I'll continue to be a happy camper. Some of the new things folks have been clamoring for such as 5.1 sound, bigger hard drive, etc., don't impact me. I'm happy enough with the sound I get, and with my usage of Tablo, I'm currently using only a small fraction of my 2 TB drive's capacity. I tend to record a lot of stuff on my 4 tuner Tablo, and delete most shows as soon as I watch them. Some of the new shows are waiting on the hard drive for summer hiatus to come, and then I'll check them out. It's like having my own Netflix, with a healthy backlog of shows awaiting watching.
I'd have to say that Tablo, for my needs, is just about perfect feature-wise, as is. As a former 19 year subscriber to DirecTV, I haven't missed it one bit. Even with subscriptions to a few OTT streaming services, I have access to more TV than I can possibly watch, and I'm paying for and getting exactly what I want. My savings over satellite have been pretty substantial.