I have a OneFinity and while the machine itself is great, the controller is garbage and the company has been really awful to deal with. I do not recommend them. Which sucks because it’s a well designed machine but dealing with these people has been bizarre.
My 1F has a 48″x32″ work space and while it takes up a large part of my shop, any smaller would be annoying. I could maybe to 32×32. But it’s helpful if you want to leave fixtures on the workspace that you’re not crammed in.
I think it’s also important to be rational about how much time investment is involved. Personally the learning curve was super steep. I went with Fusion which may or may not be less user friendly (the problem therein is that usually people are only trained in one software and I think have a hard time comparing anything to the one they used) but regardless, I probably have a solid 4 or 5 months of just fucking around before I was able to do anything constructive.
If you are making guitars, I HIGHLY recommend you do a simple Fender style electric build first. I went with some acoustic guitars and the models were pretty byzantine by the time I was done. I will have to go back and fix some stuff. Part of the learning process I think. But I just did an electric on the CNC and it was like I was barely working.
I would be interested in an Openbuilds machine if I was starting over.