They run annual Black Friday specials that end up giving you 18 months for the cost of 12.
They have advanced filtering and rules.
They have some social features I don't use but that approximate what Google Reader was mourned for.
I really rather wholeheartedly recommend them.
The only negative thing I could say about them is that they seem rather close-minded in a rather non-P.R.-friendly way to feature requests, and don't seem very interested in improving the product in ways their customers request, although they do, however, still (slowly) improve the product. It's not in stasis as many other products sometimes tend to be (cough Remember the Milk coughcough)
That having been said, to me, the product feels rather rock solid as it is in its existing functionality, and to me, it feels like a solid power tool.
Been using it for the last two years and it’s been great so far. Not sure if sub price would be justified for other people but for me the cheapest paid tier covers basically everything I need from a reader.
I pay for Inoreader as it most closely matches the Google Reader social experience for me. You can follow other users, share articles to your feed for other users to discover and comment back and forth. I always said I would have paid Google to keep Reader going, so I put my money where my mouth was with Inoreader. I do find it’s search capabilities somewhat lacking tho. Mobile app is decent, desktop website is great.
I went from Google Reader to Digg Reader to Inoreader free to Inoreader paid. Has been pretty solid I have only found one bug - sometimes it doesn't show you the same article you clicked on. Tried to report that but they wanted me to go to lengths to convince them it was not my browser environment - uninstall all extensions etc. Otherwise very happy with it.
There's a free tier with ads which I don't mind since they're non-intrusive (I honestly can't tell when the last time I noticed an ad was, and I use it daily).