Don't own an Impact, so cannot say I agree. However, I do own several Theoben Rapids, a .25 RAW HMX,, and, half a dozen BSA, AA, and, CZ PCPs. A couple of the Rapids will outshoot them all at 50M - except (on a good day) an old BSA Spitfire which has a stellar barrel and shows its John Bowkett roots. They are simple, bulletproof, and virtually maintenance free. I do believe that the Theoben regs are superior to the easily, user adjustable variety in terms of reliability. No reg creep, no leaks, no blowouts. Except for a single, pesky O-ring between the bottle and reg inlet, I have never had an issue if the rifle gets an annual inspection and maintenance. Even the unregulated models are easy to set up. When I read about "regulated" rifles with ES of 30 fps rifles, it makes me wonder about the worth of that reg. An unregulated Rapid with a 400cc bottle can easily be set up for 70 shots at 30 ft-lbs with an extreme spread of 25-30 fps. A reg will put it in single digits. If "imitation is the most sincere form of flattery", Crosman must have recognized the worth of the Rapid. The original Marauder is pretty much a direct copy if the old Theoben E-Type - right down to the shroud, magazine and MK-4 trigger.
It would seem that fine, OEM walnut from Custom Stocks and polished blue barrels are a thing of the past. But given the craftsmanship, they can still be enjoyed today. Hopefully their modern counterparts will fare the same.