I have used LP and my LDS for purchases and never had a problem with either of them. I used LP for my higher end stuff, reg., BC, dive comp., etc. And I used my LDS for mask, fins, tanks, wetsuit, boots, hood, gloves, etc.
While I saved a bundle on the LP gear, I will never feel guilty or feel that I slighted my LDS, as I certainly paid a premium on the items I did buy there. I saved hundreds LP and perhaps overpayed hundreds at my LDS. I feel I struck a balance that I can live with, and my LDS tweaks my gear for a fee just like they would (and do) with the gear they sell.
Having said THAT... my best purchase was my first. A weight-intergrated BCD. Glad I went that way, those lead weights were murder...