Don't quote me on this but I believe the biggest difference you will find with the CP+ is that it does not come with a bell hiller head. I have a CP Pro along with a few other helis. If this is going to be your first tail rotor heli I would not recommend the CP Pro. In my opinion the Blade CP Pro might be one of the hardest mainstream tail rotor heli's to fly and if you can master a Blade CP Pro I truly think you can fly anything. I have never tried a CP + but from what I understand they are not as responsive as the CP Pro. So a CP + would be better suited for entry level heli. So if you are learning I would recommend the CP + over the Pro. The Blade CP's in my opinon are not the best helis to learn on. The proper helis to learn on are very exspensvie. My T-rex 450 is a lot easier to fly than my Blade CP however there is a big price difference.

I also would have a hard time recommending someone by a used Blade CP+ if they are learning. If the helicopter is perfectly trimmed out of the box it is still hard to learn to fly. If it is a used helicopter and it is not dialed it will be very frustrating trying to learn how to fly. Unfortunately you will have no way of knowing if it is stable or not. When you get a Blade CP of the ground for the first time if will fell very unstable even if it is dialed. If you do get a used one I would recommend having someone test fly it first and make sure it is set up right before you give it a go.

This is all assuming you are going to be new to these tail rotor helis.