I am using Ownuser battery grip for my 1000D, so far no problem. There have been quite a number of reviews for third party battery grips such as Phottix and Ownuser... all of them are quite favourable. I find them okay and cheap.
For Nikon Version. I don't think so. I'm using it also. But anyway.. personal preference ba. I will not shoot during raining days so it does not affect me. E most DIY it. lolx.. put the white tape rubber around the contact point below if need it. :bsmilie: