Personally, i dont put much faith in LFS stores. Most often they sell you stuff, that they already have, which are cheap crappy skimmers. I have never seen a LFS sell a skimmer of quality. Or lights for that matter. Plus you have no idea if the store employee actually has a tank, how long he has had it, how well it runs etc. He might be there just for the pay check. Also, its their job to sell you stuff. If you dies or breaks, and you go back for more, its better for them.
There are a few good LFS out there, but they are few and far between.