I currently have a Speedster and after 5 years has started to give me a few problems but that expected new vacs, refurb pump etc. I'm very pleased with mine It's paid me back many times over.
I would buy another if I had the choice but being established gives you more options I suppose.
Anything 2nd hand may give you problems even new ones have teething issues.
If you are "handy" and can sort things out as they crop up a 2nd hand one is a good option, as long as you can get the parts.
I would personally go with a bigger pump option if you get the chance 100psi is quite low, you can upgrade the pump if the pump motor is man enough for the job. Check that out first!!!
Good luck mate