It's all personal preference. I like fixturing. It doesn't have to be fancy, it doesn't have to be expensive. With a little creativity it's pretty easy to make stops/angles/squares things like that. If you are making a frame or something, it's not hard to have some pins that drop in to make squaring it super easy. Obviously the more stuff you have or the more capability you have makes it more convenient.
Commercially purchased is almost always going to cost more money. That's what you're paying for. The Certiflat is a good blend IMO. It's super rigid because of the design, but doesn't weigh a ton for the smaller ones. It's easy to assemble and get right pretty much any way you put it together.
I get that there's guys that weld everything to their top. I'm not one of them. I've never liked that method and never will, but if it works for them great. If holes or jigs or whatever don't work for them, no sweat either.
There's always the difference between balancing time and money. I put this together for under a grand, material, holes and everything, but I got stuff where I could and bought an old table and dismantled it to take the top plate since it was a fraction of what new material cost. But it also took a while to get everything done and built.
I plan on building another one soon, but a bit different style.
