I read through the first couple of pages and wanted to post my feedback on LP:
I bought a tusa spg for my g/f on LP and we didn't use it for 90 days. When we first took it diving we did a 100' dive and it registered the max depth as 80' so it was clearly out of tune.
I called LP, they told me to send mine in and they'd send one back, shouldn't take more than 3 weeks total. I told them I was leaving on a trip in 1.5 weeks and needed faster turn around. They said put it in the notes and we'll take care of it. Needless to say I had a brand new part 2 days before I left for my trip.
Of course returning products is going to be better at your LDS, but before people totally knock LP, their service is as good as just about any online retailer (for any item). I've bought many things from them, typically things that don't need repair or service (wet suits, accessories, etc.). I did buy my BCD there and that one SPG, but that was more because they had the specific pieces I wanted.
I'll always buy my regulators at my LDS for the servicing reasons.