Only have experience with one. I bought one from Denny during the first batch. I have not shot it much(600rnds) as it is definatly a SPR when you consider the price of 69 to 77+? grn ammo.
Its shoots as well or better with 55grn and 62(Q3131a and Federal XM193, M855 none of which was PD) than anything i own under 20"(just cost a bit more
). Great, first class barrell with great balance, built like a tank but light, not too bad to look at either IMHO. etc., etc.,
If you don't plan on buying 69++grn ammo then it loses some of its appeal, but I would still stake my life on this as opposed to any M4 profile barrell or the like even with 55grn. It works with a bayo and is strong enough to handle it.
I plan on removing my DD 9.0's and replacing them with plastic HG's to make it a super strong lightweight. Making it a little less of an SPR. Tthe ONLY reason i am doing this is because i love the barrell but can't afford the 250 to 400 percent increase in price when buing the appropiate ammo. Plus i would have to be pretty tight on my sling to mess with this thing and at 140lbs i don't think i could effect it using a sling with all my might
I bought it to shoot the big bad new ammo but times$$ have changed for me.
I do not have any Knowledge or the other barrell and can not comment but I have rarley if ever heard bad things about CMMG from informative posters.
ranting a bit...hope it helps...Feel free to IM with any questions.
lobsterman
kyle