When I was a lad, I wanted to buy a coco2. I ended up buying a c64 because of the games.
OS9 and the 6809 as stated in the thread are a very nice combination. I learned how to machine language and assembly on a multi-68020 OS 9 cluster. This is part of the reason I wanted an Amiga, that and a production job. Assembly on the 680x0 is so easy as compared to x86.
Ah, someone else with OS9 68K experience.
I was the retail manager of Delmar Company when we introduced the System IV and System V computers (68000 and 68020 based respectively).
I even encouraged our owners to invest in a port of Gwindows (a GUI written by Steve Adams for Gespac) for our systems.
In fact, I just exchanged a message today with a guy who wrote a basic text editor we used a lot (VED) Bob van der Poel.
But Steven is right, the Coco3 actually has some advantages over the 8 bit Ataris. Its display generator doesn't have Sprites, but it does support up to 640 by 192 resolutions and 80 column text displays. And unlike earlier Cocos, its got a interrupt generator that eliminated the need for software timing loops (and it can be expanded to 512K).
Plus it will run older Color computer software, Coco3 specific titles, and OS9 Level 2.
Right now an Atari modified with this board will only boot NitrosOS9.
I just like the 6809 processor more then the 6502 (almost as much as the 68000).