Hi Colin
You are in the right place. :-)
This is also the place where you don`t get a stright answer to your headline question.
I can share from my personal experience, and I`m pretty sure others will chime in.
Brand vs brand:
I have a couple of GS lasers, and the build quality is high compaired to other brands made in china. I don`t own any of the disco series, and i would probably stay clear. The reason is the big difference in divergence from the different modules. Red will be more or less a big red touch. The blue will be much smaller dot or beam, and the green (532nm DPPS) will make a very narrow small beam compaired to the red and blue. It might not be to obvious when doing beams, but for graphics it`s a nogo.
Look at the full doide series. In the lower power-range the modules are not corrected meaning the divergence will be quite high here also.
As for the galvos, the standard "cheap" galvos Goldenstar uses, is quite nice, but they dont scan very wide. The DT ant PT scanners are all good, but stay at 30K or better if you want to do any kind of graphics.
There are also other china made lasers, who have earned a good rep here at PL. Eightonlight also have good products, and good service.
Remember fright are cheap from china, but not free.
Most of them are willing to sell one pcs at a time. Just send them a PM and ask for a pricelist. Dealing about the paperwork will be a personal matter for you. Probably solved just fine.
As for Laserworld, i have no personal experience, but have registered that used and parts for repair are frequently out on sale. The rep here at PL are questionable as they often overspec the lasers in adds.
A 50 meter ILDA cable will not case any delay in signal. I don`t own such a long cable, but have thoughts about the resistance and think there might be issues there. I really high quality cable will be needed for sure.
It seems that you have been reading up on lasersafety. Essential for this hobby. Good. A killswitch will not solve any situation, and a simple grounding issue might case a module to still produce a 100% beam even if the interlock loop is closed. That is why a mechanical shutter aslo shoud be in place. Masking the projector for physical stopping the beam reaching audience is also reccomended.
I Can`t stop this post without a suggestion. Why not try to build your own box. If your time is money, then it`s a bac idea. But what a hobby. Quite easy getting started, and learning new stuff almost every time you start fiddeling around. It require some basic knowlage about electronics, but most is common sens, trial and (expensive) error.
Best of luck in getting into the bottomless moneypit - the laserhobby.
Espen
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More projects than time available.
More projects started than finished.
More money spent than earned.
More failure than success.
Just got to love lasers!