ive been running the freak system for about 2-years, and have very good luck with it. I also just recently purchased a .688 ultralite, but have not had a chance to test it out. I also noticed that on Dye's web site, they ore only listing the .688. I do not know if Dye is still making the other bore sizes. Others are checking into this. Dye is known for light weight and quality, while smartparts is on everyone's shiet list, but inserts are cheaper than back peices.