When RaceAmerica sold out of RT50 Practice Trees, we were already busy designing a smaller, more portable version when the iPad was introduced. The problem of practicing your reaction skills is, it can only happen when the equipment is available. Lugging RT practice equipment along with you was not very desirable. Everyone who owns an Apple iPad knows how often it travels with them. The XLDrag PRO app for the iPad combines RaceAmerica's RT50 Practice Tree features with the portability of those little plastic practice boxes. Now the RT practice equipment can travel with you -- with the convenience and size of the iPad.