I've got a couple of Android tablets, and two BlackBerry PlayBooks.
The Android tablets are 10", work OK, stable, perform reasonably, but are on a rather aging version of Android.
The PlayBooks are without doubt, the most well constructed, quality tablet I've ever physically encountered. Sure, it's suffered with poor software support / apps, and still there's some stark gaps in the apps available. But the OS is simply excellent, stable, true multi-tasking, gesture driven, rock-solid behaviour. Two front-mounted stereo speakers, and HDMI out. 64G of onboard storage (not expandable - no microsd capabilities). The first one I've got cost me £129, last September time, the 2nd cost me just under £100 a couple of months back.
Notwithstanding some stark gaps in app support, I think they're great - stable, very easy to use (in that respect, a worthy contender for the olds, in comparison to an iPad), and ideal if you want the normal - email, web surfing, video and music playback. If you want a dearth of fart apps, and the latest meme, you may be out of luck, but they can make a very decent choice.
I'm not here advocating them, per se, though - they're over 2 years old as a tablet model, now, and increasingly difficult to get, new, due to them being sold so heavily discounted.
But in comparison to iPads, several family members have them - and they are fine and I get why people would buy them, price no object. Personally I wouldn't - because I wouldn't have been prepared to pay their price premium when I initially, and speculatively, bought a tablet. But the reason for mentioning being I have relatives who own an iPad, who weren't getting much use out of it, truth be told. And when it had to be returned for repair (the home button stopped working, and all the normal internet fixes didn't resolve) I showed them my PlayBook. Next thing you know, Jed's a millionaire, and when I next go 'round they've been out and bought a PlayBook, too.
For all those that got them at their heavily discounted price, you got a premium tablet, with unequalled build quality, a truly great OS, which is fluid and truly simple to use and control, and assuming you're informed up front about some notable gaps in available apps, has made a true bargain for many.