From what I found on the internet promaster filters are basically Hoya brand filters that aren't multicoated and sold under a different name. Personally, I wouldn't skimp on a polarizer since worse polarizers tend to give the image a bit of a cast or in the case of a non-multi-coated polarizer give flare unless you're using some of the top notch glass you used to get from the german made filters in the 80's. I would recommend something from B+W since the design of those and build quality is downright fantastic. The glass they use is very specially coated to remove any ghosting and provide as even a polarizing effect as is possible even with very wide lenses. I'd compromise with run of the mill UV filters or clear filters but a polarizer definitely has a big impact on photo quality and thus you want something that will give you the best images. If you don't want to spend much the multicoated Hoyas (Hoya HMC) are great deals. If you don't mind spending some more, B+W made filters are the best stuff you can get.