Freshhair, I currently wear a stock unit, and it is like any other unit in wear and tear. Mine happens to be in french lace, and I don't have any experience with SFS. You don't want to cut the hairline shape other than the excess lace due to losing the progression in the hairline density, unless you have no progression in your custom order. Also, if you want a CC front in your custom, you may not want an A front in your stock unit depending on your hairstyle. I believe TL stock units are medium density, A front, SFS lace; contact John and he will be able give you the specs. BTW keep a copy of your template in case you have to cut a stock unit to your size.

You other guys, calm down: it's only hair.