Feature:
This is its strong point. The backwards effect is great, very Hendrix-y. The selection of delay times is superb, and I can't even begin to describe the Warp mode. Sound aside, the stereo input and tap tempo features are very useful. A very versatile pedal.

Quality:
Boss makes it. It will last forever.

Value:
It is pretty expensive, but it has a lot of useful features that a lot of other pedals in it's price range don't have. If you need something this versatile, it is a good (not great) buy.

Desirability:
If you swear by Boss pedals, this is the best compact delay they offer. If you don't need all the bells and whistles, look elsewhere.

Sound:
Your basic digital delay sound. The backwards effect sounds great. Very psychadellic.

Ease of Use:
The controls may look daunting at first, but they are very easy to get used to. The internal tap tempo feature is something that sets this apart from a lot of other delay pedals.

Support:
Never needed it.

Overall:
As far as compact digital delays go, this is one of the best. It's only big competition is the Line six Echo Park. Worth trying out.