It's not necessary you can try the other models too If you are not so confident with your skills. As far as I know there are the other type of gliders too, but their performance is limited.I would think the DLG is a good step however build is a bit more involved, but with most DLG's you will need to get used to putting them together.I have had a few goes on DLG's and it flies nicely and I have launched it into the ground after slipping, they are on the tougher side.
Regards
Brett
Nitrotek