I have a pile of slides here that have had their lugs bashed to crap by tilting barrels, and no longer work with tilting barrels because of the damage.
I kept them all for research and development, and it's a good thing I did, because they're all being revived with the fixed barrels. Combine them with fixed barrels, and they work just like new again.
The fixed barrels really do increase the life of your slide INFINITELY, because the barrels do not contact the slide AT ALL.
As for the chamber markings, what's wrong with them?
Custom engravings can all be done, no problem. Just depends on whether you are willing to pay the extra cost. Base markings are ".45 ACP", ".38 SUPER", and plain blank.
The exception, of course, is if you buy barrels from another brand... there are some out there that mark them specifically with their own markings that a lot of people don't like.