The Summa guys at ISA said that the network is pretty much gone with the fall of Tekgraf who was their Master Distributor. It sounded like Summa was planning on running on their own for a while.
You didn't say what you were looking for. I've never owned one of their printers, so I don't know much about them, but I do have a couple of the S Class T series cutter machines and can tell you about them.
They're both workhorses. We've had no problems at all after eighteen months of ownership and daily 4-8 hour cutting sessions through laminated vinyl. When I called tech support to get a couple of questions answered, they were answered promptly and accurately. I would purchase these machines again without hesitation.