Generally found them to be good and worth the money.
Really like the Lofi Machine, good sound for what I wanted and worked well with bass. Found the Electric Lady (Electric Mistress clone I think) to be a bit over the top, not a very subtle sound compared with other flangers that I've used, but depends what you like I guess.
The only one I tried that I really didn't think had anything going for it was the Bass Sweeper, (clone of some envelope filter, forget which one though). I thought it lacked any sort of oomph and was very dull sounding, couldn't get anything interesting out of it.
On the whole though the pedals do seem to be worth trying out considering the price and the size.