I've been flying for about 9 years and I think that everybody should keep an fly their trainers. As an instructor I get to fly a lot of trainers, but their not as fun as my old trainer. I've done a few things to my trainer since I've soloed. It was a tower trainer 40 with an OS 40 FS on it originally. I recovered the plane, sealed all the hinge gaps, converted it from rubber bands to wing screws, and put an OS 46 FX in it. Every now and then I take it to the field to fly it. Take your trainer and work at flying the same acrobatic maneuvers you fly with your other planes. Doing them on the trainer where you have to really work at makes me better when I get to my sport planes. It works for me. The other thing I think is really funny, when you are learning to fly you wonder how a plane can fly so fast, and then when you come back to your trainer you wonder how a plane can fly sooooo slooooowww.

So for me my trainer will always be in my hanger.

Just adding my .02 cents worth