I used to have loads of burn outs done for me before I built a table. For my work I use mostly 3/8" thru 1" mild steel. I personally have no experience with running plasma on my table. Soon to be installed.
I tried with (3) different steel suppliers getting plasma cut parts. I found that everything 3/8" was fine. Most 1/2" was ok. Anything thicker than that had by far to much bevel & inconsistency across the cut edge for me to jig & weld into the final assemblys.
I was also being charged the same price for plasma processed parts as Ox/Fuel burned parts. So I went back to everything above 3/8" OX/Fuel process only.
I'm not saying that better results cannot be obtained on thicker material. It has left me skeptical at best.
I will find out some time in the not to distant future, how good I will be at it. The 1650 is what I have been thinking of buying. Realistically though I have no hopes of using it for what I need, at much, if anything over 1/2". Of course this is based on the above stated reasons. Plus the fact that cut speeds (or so I have been told) on plasma & oxy end up nearly the same on thicker material.
If it works.....Don't fix it!