I have been shooting recurves for the last 53 years but only started shooting longbows about 3 years ago. I now have a bunch of longbows, although each of them has at least a little reflex/deflex, and some have a lot. Shooting the longbows took a little bit of adjustment, but I think most of that was getting used to lower, smaller grips than the recurves I had used over the years. When I tried longbows with grips similar to my recurves, like Morrisons, there was not really any big difference in the feel. Now that I have 40+ bows that are both recurves and longbows, I switch from one kind to the other without even think about it. I'm sure if I shot only one bow I would be a better shooter; however, I now find there is just as much difference in feel between some recurves (or longbows) as there is between a recurve and a longbow.
Allan