The biggest issue that I have with my Weathertech matt is my driver side mat.
There is is a small gap between the trim and the left side of the mat. I think this is caused because when I get out of my car, I use my right foot to push myself out and then the left side of the mat gets "pushed" out from the trim a bit thus causing the gap. I tried to rectify the situation by placing velcro strips along the left side of the mat and and long the corresponding plastic door opening trim. It lasts awhile but then over time and heat/cold cycles the adhesive wears and then the the velcoro pulls off the mat and then we are back to square one. (I even tried superglue!) The fit of the passgenger side mat is wonderful, mostly because no one hardly sits on the side.
If anyone has some better ideas I am open to try them out.
2009 G8 GT - Premium and Sport Packages
Mods - Roto-Fab Intake, BMR Front and Rear Sway Bars, BMR RTAs, BMR Steering Rack Bushing, BMR Rear Cradle Bushing Inserts, and Cortex Tune. Summer set-up - 18x9.5 TSWs - Cooper 275/40/18 RS3-S, squared.
Future Mods - Cam swap with all the fixings