With weightgainer powders, you really gotta look at the labels and see what's bad in it.. The main things you DO NOT want in a gainer are:
High fructose corn syrup
Crystalline fructose
Maltodextrin
Sucrose (I believe most Weider products pile this one in there, with 17g of milk protein..)
Cytogainer by CytoSport is a good product, Up Your Mass by MHP is also a good gainer.. Both are reasonable price-wise, UYM uses mostly milled brown rice and oat powder for carbs.. CytoGainer only has 5g simple sugars per serving (84g carbs per serving)..