i'm building the Reactor midwing which is fabbed using the same standards as the Ultimate. i just received the Reactor bipe and the amount of prefabrication is night and day difference between the 2.
i also read the review on the Ultimate and i would go for the Reactor bipe if i were you.........it's one of the nicest kits i have seen from Great Planes........the quality alone makes me want another one.

i have also built the GP Super Skybolt, Super Stearman and the Big Stik.
if all their new kits are anything like the Reactor bipe kit, i'll forget about building anything from a kit anymore.