True, but i'd rather get a more expensive machine than risk losing a racket. Beside, I might string for other people eventually (for mony of course ) and a better machine will probably make my job a bit easier.
I've strung for other people and you basically have nothing to worry about. I guess the advantage of the one you want is that it WILL be more stable, but I actually think it won't make your job "easier" because of the extra set up.
Like I said, after a while you sort of dread having to string 3 rackets when you just strung them 4 days ago, and all the extra points would only make it worse... for me anyways. The simpler the better.
Everything else is the same. Your stringer will hold the racket better, allow for less stress on the frame. And probably 3 or 4 minutes more time securing the racket into place. Ugh. The part I hate the most about stringing is getting the racket into place and string in and measure properly. Once I start it's not so bad. I can watch TV and do it.