Again, sorry to hear that you had a bad experience. However, I'm a firm believer in the one-in-ten rule: for every one person who encounters a problem with a product, chances are there are 10 (or more) people who are satisfied.
I personally installed my Synergy ball joints, greased them initially, greased after a break-in of about 1000 kms (regear break-in period), and now regularly with oil changes. I've beaten my rig offroad, she is my DD, and I've had her up in the lift and she's given me no indication of worn ball joints whatsoever.
I'll be sure to keep you posted if I encounter any problems.
I'd highly encourage all end-users of Synergy Ball joints to chime in - whether positive or negative to get a real feel about how this product is. If they are problematic - I'm sure that everyone would like to know. I've scanned the threads about the comparisons between the Synergy ball joints and the stock ones - between that and the price - that is what sold me in the past. So far so good.