I actually have 2 MRP uppers and 1 MWS and really like the options. I picked up both MRPs used as well as a number of my barrels. I had a 10.5" Noveske 300BLK barrel converted and really like it. LMT has a 16" 300BLK barrel listed on the site but seem to be very slow in getting numbers out... one member here has one of the barrels. Ive got a 12.5" 6.8, 14.5" 6.8, 18" SS 5.56, 16" 5.56, 12" piston 5.56, 11" 22lr. Photo below is old... sold a 14.5" 5.56 and added an 18" 6.5pcc wildcat. The barrel on top (lower picture) is a Noveske 20" 6.5 Creedmoor converted for the MWS. The 308 barrel, chopped to 14.5", with a pinned 51T comp is not pictured.
I've definitely come out way cheaper vs 10 complete monolithic uppers. I don't mind spending on premium barrels given that I don't have to reinvest in new uppers and rails for each barrel. Running the 762-SDN-6 up and down the line up.