I've never had a problem with the big 3 harddrive manufacturers (WD, Maxtor and Seagate). Usually in about 6 weeks you get your $$$.
But with all these horror stories you have to begin to take these rebates with a grain of salt. If Soyo pissess enough people off, people will stop buying their products.
One other thing. READ THE FINE PRINT. Anytime you make a purchase and there's a rebate involved, make sure you do EVERYTHING properly before you send out the rebate form, UPC, etc. These companies are just looking for an excuse to jerk you around.
You've tried and failed. The lesson here is, never try again. -- Homer Simpson.