Add me to the "worth every penny" crowd. Brilliant. Have one for both .40 and 9mm pistols and STANAG mags for the AR.
The AR one tho is for stripper clips. Makes it reeeeel fast to reload 10 (or 30) even if they aren't on clips. The one-at-a-time .223/5.56 one I think may be less useful.
Best money you'll ever spend if you value your fingers.