Josh, give us some more details about your experience. It's pretty common to suggest a trainer for someone who's making the transition from park flyer to glow. The reason for this is that glow planes fly faster so some transition is usually required. The characteristics of a trainer mean this transition will be less likely to result in crashing your plane.

However, if you can really wring out your park flyer and you've got an instructor ready to help you with the transition to glow, it's also possible that you can bypass the trainer and go to something that would be typically recommended as a second plane. Since glow engines do require learning some new skills, you definitely should get help.

As you can tell, I don't buy into the myth that bigger is better. My first plane was a .15 and it flew as slow and gentle as any .45 trainer on the market. There are plenty of smaller planes available, and lots of reasons to choose one. In my fleet right now I've got 2 .10-.15 size, 2 .25 size, and 2 .45 size planes. The planes from the 2 smaller groups go to the field way more often than the .45 ones. They are usually stored in the shop with the wing still attached, because they fit in the car this way. One even fits in the trunk with the wing on. I can take 3 or 4 planes to the field in my Sebring convertable without even using the front passenger seat, and leaving the top up. Try this with .45 size planes. Add to the smaller size the fact that they use less fuel, will fly longer on the same size receiver battery, can take off, fly, and land in smaller spaces, and it's easy to see why a person might want some of this size plane in their fleet.

It's all a matter of preference, and only you can decide what you like best. I say go for it, I've had lots of fun with small planes.