I have 2 Coopers:
Jackson Game w great wood in 7mm08. Shoots Superformance 139 gr SST into same hole and 140 GR Accubonds in nobler factory ammo just under half inch.
Great on Whitetail. Nothing long range so far though. Gongs out to 600.
Montana varminter in 25-06. Shoots 110gr Accubond, 100gr NPT, 115 gr npt, and 117 gr superformance sst all same point of impact under 3/4". I actually shot a 4 shot 3/4" group at 100 with one of each. So now I am shooting through my 117 gr SST boxes (1 left) then I will move on to 3 boxes of 100gr npt, then a box of 115 gr npt and end up with my 1/3" grouping doubletap 110 gr acubonds for the coming years. Worst group is with 115 gr npt at 3/4. This rifle is a well built machine. Gongs out to 600 yards no problem.
Yes they are becoming more expensive.
In my book these rifles appreciate over time. They are easier to sell than a custom rem and your money is well parked. Easier to fetch high dollar on gun broker for a cooper than for a custom build. My .02