Cost/Value: I think this cost me ~$6 at Walgreens. It lasted for about 2 months, which comes to about ~30 uses total. Not too bad.
Scent: Not too fond of it. Like a cheap fragrance, but anything is better than sour smelling hair!
Application: Easy! Lift sections of hair, spray at the roots (not at the hair shaft), and rub it in with your fingers. I spray more near my bangs, since those strands get the oiliest.
Results: Pretty good! Not like freshly washed hair, but much better than 2nd day hair. If you spray too much on the hair shaft, you can get white patches. But it's no big deal, just smooth it away with your fingers.
Before: hair is dull and stale After: hair has more body and flow!
(Results are more apparent in real life. :P)
Repurchase: Yes! I've tried Ojon and Oscar Blandi, and they both yield pretty similar results on my hair. They definitely smell much better than Psssssst!, but I can't really afford those right now. :)