What is great about the Priv is that it is powered by Google OS, but is wrapped in BlackBerry hardware. In my own opinion, I think it is the best of both worlds. Google Play has a plethora of apps and you should be able to find the equivalent (or better version) of your apps in there.
As far as hardware issues, every case and every individual phone is different: what is true for some users may not be true for you. But I get your worry: with the slide-out keyboard - though it's an AMAZING feature - there is definitely room for breaks and malfunctioning. But when you buy any device, you're always taking a risk that it may be easily broken or damaged. But BlackBerry is a special case because of the platform itself.
Chen said somewhere a while back that BB would be sticking to at least software if they do not make a sizable comeback in the near future (if I misquoted him/things have changed since then, I apologize - feel free to correct me! But I'm almost positive I read this somewhere on the forums here or on CrackBerry). And when you buy a phone on a contract basis, the company is obligated to give you at least your contract's worth of OS support, updates, troubleshooting, etc. If BlackBerry does go under or the company has more trouble, it is not as if your phone will just stop working. And even if something happens that you keep it for a long time and they stop putting out updates, your phone will still work - you just won't get any more software updates, etc.
All in all, the choice is yours and you should research the Priv and try it out for yourself to see if it really meets your needs. Actually, I would really suggest hopping on over to CrackBerry, as those forums are specially tailored to BB products and there are BB experts who can also assist you if you have any questions.

Good luck!
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