I made that mistake too. After 2 years with a Metcal, I now use my old trusty Pace MBT250 again. Replaced the SX-70 with the SX-100 and whished I had done that 2 years ago instead of investing 800 euro in that piece of Metcrap.
I was in doubt too because my Pace was so old. I mailed Pace for advise and they helped me to sort out what to do to update my Pace (partnrs etc)
If you are used to Pace I do not think you like a B-brand. I have good experiance with Weller too. (WS81) I use that for smd)