Good call brother.
I learned to ride on a Daytona 955i, NOT A GOOD CHOICE. The ONLY thing that prevented me from having a wreck, and i do mean ONLY, is the long throw throttle on that bike, it takes like 70% rotation to hit full throttle. That said, it meant I was comfortable with power wheelies, rear wheel spin mid corner, and head shake within my first month on two wheels as they were/are part of riding a Daytona 955i. All three of those are pretty easy to induce on an R3, so, a month in on a cruiser, nope, he's not going to have those skills yet.
The R3 has a short, 1/4 turn throttle and SUPER easy to write a check with the power of the bike that the brakes and chassis can't cash into a turn. I would only ever recommend an R3 to someone who's got plenty of seat time on a Liter bike, or a lot of time (like years and years) riding.
If my R3 didn't have ABS, i can clearly think of at least 3 times I probably would have died over my 2.5 years of ownership, all of which, were me playing when I shouldn't have been, under estimating the big girls ability to put on speed, and having to SLAM on the brakes just before a turn because I overcooked it coming into the turn.