Okay, here's a targeted question for those who pondered buying a 500, or getting the 700 with the Seneca RTS-500 bit adapter to have access to the full range of domino sizes, and bought the 700 w/ RTS-500 adapter and adapter plate for 3/4 sheet goods...
Now that you went with the larger tool and have a little experience with it, any regrets in not buying the smaller machine for working with 5 and 6 mm dominos? Maybe 90% of my work would be fine with the smaller domino, but I have ~20 chairs in my near future which would really benefit from the deeper tenons I could get from the 700. The rest of my planned work would be just fine with the 500 series domino.
Andy