If you are thinking heavier use and don’t plan on running it at craft shows or what have you, upgrade because of the better laser optics, cooling, and opportunity to work the passthrough into your projects. I ordered a pro + filter, but if the added cost needs to be minimized you can go without filter as long as you have a way to route a vent hose outside.
The safety glasses for anybody around the machine is probably one “safe” bet you can make around what you’ll need to comply with rules in a commercial operation of any kind. Here’s a note from @dan on it from a couple of weeks ago: