The D610 is an excellent cutter. I have one that is over 10 years old and still cuts like brand new (a real workhorse).
I just got a graphtec fc7000-130 primarily because of the 54" width but the summa still gets used on a daily basis for the 24" and under stuff.
I also have a summa d60 we use on the road and it gets bounced around in the trailer like a beachball and not a single problem with it. You will not hear a bad thing about Summa's from me.