I recently bought the Mizuno Tour rain suit, largely on the recommendation of Today's Golfer. First time out was in the driving rain for 16 of 18 holes, and my playing partner who had an ageing Pro-Quip Neptune suit was rather soggy by teh end.
I was dry and warm, and the added bonus is that it doesn't sound like you're wrapped in bacofoil when you swing!
Only slight issue is with the neck of the jacket. If you don't have it zipped up to the top it can flap against your neck, but only in very high wind, and I guess that you would probably be wearing a polo then anyway.