I haven't used the Aerostich ones, but have and use the Wolfman ones. I guess it depends on how picky you are. I have found that if they are on long enough, eventually dust will get between the bag and tank and make micro scratches. I've not found major grinding off of decals or anything like that.
If you are very particular, you can coat the tank area where the bags sit with a clear decal coating like used for numberplate backgrounds.