I have the OEM liner and its fine (about $60 usd). I have heard its pretty much the same as the Weathertec but don't quote me on that. Last week a red bull was pinched back there and completely leaked out. The liner kept the carpet 100% untouched! I load and unload heavy items almost daily in my X so the liner was a must. The carpet is still like new. Glad I bought it!
Oh, and :xoutpost: BTW I'm also a musician