I use the Associated one and cut out with an exacto as described. Compared to the Jconcepts (the only other that I've tried) protector the AE adhesive is not as strong, and so it does not adhere as well, but also removes easier and leaves only minimal residue. The JC sheet can be a bear to remove. The AE sheet is foggy, the JC clear. It's a tradeoff.
Team Associated | Reedy | Airtronics
RC Excitement: Fitchburg, MA | RC Madness: Enfield, CT | Horsham RC