I'd love a 12" jointer but I'd pass on a 20" planer, 20" belt sander maybe but not a planer. I upgraded from the 12.5" dewalt to a 13" jet planer/moulder, if it weren't for the need to make moulding I'd have gone for a similarly priced 16" planer. Just can't image the need for a 20" planer, anything smaller would have always fit in a 15 or 16" planer and the few times was a real nuisance only having a 12.5". OTOH any time I had something that was actually wide to plane it wouldn't fit in a 20" and even if it could weight wise I wouldn't want to try. Typically a benchtop or counter top which tend to be 24" wide or a tabletop which can be wider. I think a large part of the popularity of 13" for a lunchbox planer is that it will accommodate most projects and anything it doesn't 95% of the time (based on my experience) you need some really big equipment. To me this hinders the deal.
However I've had plenty of need to joint 7-10" boards and even a couple of 11-12" so I do wish for that size jointer, usually I have to joint the center of a much wider board then send it through the planer riding on a board in the jointed section, so annoying, this is what I'd being dealing for if anything.
Biggest issue is they're grizzly, I couldn't get them to warranty a burned up motor since I didn't have the receipt showing it was purchased less then a year ago, their info plate on the motor showed that it had been made less then a year prior but that wasn't proof enough it was less then a year old. Even trying to find out information to make a purchase their customer service reps were rude and uncaring. I freely admit I love the bandsaw I bought from them but I'd never send them another dime for a tool. Ultimately I wouldn't give up better quality anything for grizzly especially if I have to pay as well. With their sales you could buy what you need new with 2300, or from Baileigh or Jet.
