No.

I think things like early access are aimed towards the Minecraft Generation eg. people younger than me.  I do not see the entertainment value in playing a limited, buggy version of a game and sending feedback to the devs, let alone paying for the privilege to do so.  I also don't believe that games get better when developers listen to the gamers.  Give us what we don't yet know we want, dammit!

Absolutely not. Once a dev has your money, they have little incentive to finish the game. I remember this happening to the game Towns on Steam.

I'm convinced I bought Minecraft before it was finished (is it even finished?) but I can find no evidence that this ever actually occurred. So if I did buy it, then I regret buying it, because without the evidence that I bought it I can't actually play it.

I think Supreme's generation point is interesting. I would apply it to games themselves: a lot of games that are popular these days (that no one here plays because everyone is old) wouldn't be much improved if they were a finished product. Minecraft wasn't that much different during the beta, right? Nor DayZ? Shit, I haven't played any of them either.

No I've never paid for early access to an unfinished game. I can't say that I never would though as it could depend on a variety of conditions such as what game it was and what exactly you got as part of the purchase. Sometimes it can a fun experience searching a game for bugs.

I would like to add to my argument about 'this kind of stuff' being aimed at the Minecraft generation by pointing out that 'this kind of thing' hinges on the need for self-vindication that the youth these days seem to constantly crave.  Thanks to Facebook and even more so Youtube, every knob can pollute the internet with endless amounts of data and get at least some likes or views out of it.  This then encourages them to think that, yes, their opinion actually does matter, which in turn feeds nicely into the 'we value your opinion, so please pay us so you too can help us make our game slightly less terrible' vibe of Kickstarter and Early Access.

Of course, this is my personal view on the matter, and I have clearly been born too early to get what all this is about.  All I know is that I have a 10-year old relative who'll upload video's of him playing games and commenting on them to youtube, which frankly, when applied to a global scale, is a huge waste of energy and resources.

Off the top of my head, I can only recall one bad experience with early access games I've tried, and that's Under the Ocean (a supposed sandboxy survival 2-D game that was abandoned by its developer not long ago). Outside of that one, there's a bunch of stuff I've tried and enjoyed, as well as games I own that probably wouldn't have been made at all without early access, games such as Starbound, Prison Architect, Darkest Dungeon, Kerbal Space Program (which makes me feel stupid everytime I try to play it), The Long Dark, Divinity: Original Sin, Plague Inc: Evolved, Wasteland 2.

Closest I've ever been to playing an unfinished game early would be playing the Halo multi-player beta's. That's about it.

I don't see the point in playing a game before its done...isn't that what demos are for?