The Prizum's are widely considered not worth the plastic they are made of, where as Aquamedic Minifloators are regarded as good HOB's. I only use the latter. For smaller tanks, it would be OK, but the claim of suitable for 600l that the modle I use is rated for is seriously overstating it's capabilities. 200l at a push would be more realistic IMO...
What tank are you kitting out, and how heavy will the stocking be? Also, is this a reef or not?
All the best
Rabbut