Yes indeed. I've been saving my pennies for the Horotec press, but am using the same lever press as Demon in the meantime. With all the but the thinnest and most fragile crystals, I always do the same thing suggested by avitt. Press and rotate, press and rotate. With the thin/fragile ones, though, I don't want to apply any uneven pressure so I try very hard to get them in evenly with a single press.
The Horotec I've had my eye on has delrin dies but has brass threaded inserts in the middle. I think this is the best of both worlds as it should prevent the lateral movement that often causes uneven insertion on the lower end presses, as well as providing the delrin/nylon edge that is easier on AR than aluminum.
@avitt, have you pressed AR crystals in using the Bergeon aluminum dies directly on the crystal surface?