[quote author=Robert T Higaki link=topic=726'.msg49534#msg49534 date=1248'4'295]
Are you completely satisfied with this plug-in?
[/quote]
Absolutely Bob. It's relatively inexpensive ($15 IIRC). It integrates directly into PS as a plugin, and works fine as an external editor in LR. Obviously as an external editor, LR will create a bitmapped image (TIFF or whatever) to pass to the editor (in exactly the same way as it does when you choose to edit in PS), but that's a restriction of LR's integration with any external editor, rather than any limitation with the PTLens plugin.
It copes well with the barrel distortion in wide images from my Canon 17-85mm.
I got a Canon 55-25'mm a while back, and the PTLens database didn't contain corrections for that lens. I followed the instructions on the PTLens website for shooting some calibration images with the lens, sent them off to the PTLens guy, and got back an updated PTLens within about 2 days with support for that lens.
I suppose it depends on what lens(es) you have, but from your posting, you imply that you do have some images that would benefit from some distortion correction, so I would contend that paying $15 for PTLens is a no-brainer for you. ;-)