Drove 30 miles ( one way) to HD to get some. Cleaned up the PDVC and put the chow in there and WOW..... Great heat, comparable to somersets for me. After 6 hours, my glass is still clean and see through. Even with the somersets / barefoots my window get some ash on it after a couple of hours.. I put the FSU in the EF2, Jury is still out on them. They look like somersets in the size.