It's currently 50% on PS+ so I'm thinking I'll get it. The only reason I'm hesitating is that I'm getting Fallout 3 tomorrow (all the DLC is free at the moment) and I'm wondering if it's worth the $8 for something I'll probably only play tonight then never even finish. It got me thinking about the value of downloadable games; so first, should I buy Trine? but more importantly; how do you view the value for money of these small downloadable games? 
 
Personally, I realised that it costs me less to buy a game that'll give me like 5 hours of fun than it does to buy lunch everyday. Put that why it seems like a great deal, but I'm still kinda hesitant; it's weird.

I got it for $5 during some Steam sale a while back and I definitely got my money's worth. I'm not sure how well the game controls on a console, though. I really like what they did with that game. The wizard adds a LOT to the platforming aspect of it. Really neat.

No, it's crap, and pointless impulse buying like that on stuff you'll barely play is one of the most common ways gamers waste their money. Be strong.

It depends on what sort of gamer you are, really. If you like puzzle games, sure as hell go for it. Brilliant game in that aspect, but is $8 really going to strap your cash for your Fallout 3 purchase?

The more I think about this, the more I question its ability to handle well on a console. I'm not sure how they even do it. I would say hold off and wait until it goes on sale on Steam again.
 
Also, to the value question, I would say that if a game holds my attention for 1 hour per dollar spent, I generally consider that a success. Of course there is also the whole quality vs quantity aspect, so it's kinda difficult to answer briefly.

"if a game holds my attention for 1 hour per dollar spent, I generally consider that a success."  

I guess if you are looking into it you must be interested in games of its type. It's fun, you should play it.

I bought Trine at full price on PSN and loved it. If you buy it and don't play it right now because you have Fallout 3 at least you have it in your collection for a good price when the inevitable gaming drought happens. I would say you go for it

Absolutely! Trine's visual presentation (and gameplay) is very unique.

At 5$ cost many games seem tempting, but you really should do a bit of background check before buying any games (I say this now after buying over 100$ worth of cheap games on Steam).

And please support Finnish game development ;).