I have had the same problem as Chris, one combo desoldered at Kiddie last year, then I resoldered with Deans solder and it came off again next run. I must admit to never once having considered soldering them in for pure hassle and so often they look terrible. Also the heat you pump into the 2 end cells can't do them any good.
I hadn't realised you'd gone to this pure LRP combo but sounds an excellent idea, I think for my 07 cells I'll defo go for all new, whatever brand that turns out to be. Anyone want to buy any 2nd hand connectors?