I have done a comparison with ps anti glare and an RM15 anti glare sp I bought from LYN. the difference is quite minimal. There are of course the really cheap ass rm10 ones that suck big time but seriously the difference in visual clarity is only 10~15% on the power support. Buy yes there is difference but to fork out RM89 for a sp for that minimal difference to me is very subjective.
Right now I gave in and use a clear type sp that I bought in epicenter in singapore (abt SGD$14.9 for front n back). Buy I sure have to admit... I really really miss my anti glare sp cos the feel is very different. Plus, the fingerprints are driving mr nuts