A mate of mine had some problems with some forge bits that had split and even had a hole in the IC where it wasnt welded properly. They were causing him various problems until we found them during a leak test. Luckily it was still in the warranty period and they were changed. Usually I'd say you gets what you pay, but I've had no problems with the "cheap" silicone bends I have bought from eBay etc. So I'd be inclined to try them out.