just wanted to pick up a host of nds, and was wondering if these things would cut the mustard for a basic nd filter array. they are pretty inexpensive, but if i tried to buy an entire nd filter set from say tiffen, my cost is going to more than double . so im wondering if anyone has any say on the el cheapo brand as far as getting the job done for nd. ive got a very nice polarizer that they will be used in combination with