I've had it for 2-3 years now and it's been pretty great. Granted service can be kinda spotty because it's 2G and I'm not sure how much longer it will be viable when 2G is phased out. It's also very expensive compared to dumb alternatives but I don't know of any other phone on the market that is so clean in terms of physical design and UX.
Punkt is making an MP-02 which will run on 4G I believe but I'm not sure if it will be as minimal. I think they're partnering with Blackberry to bring like secure email or messaging or something, which to me seems anti-dumphone, but I guess people expressed demand in a user survey...