Is it worth it from an item/reward-to-dollar standpoint? No, you only grab one extra month of premium and no extra in-game currency, and the founder's mechs are all stock variants with a 50% boost.
On the other hand, from a Battletech perspective, I'm happy to support the game. The core game itself is pretty solid, it's going to come down to their metagame implementation, which based on everything they've brought up so far, and the core game experience, I was confident enough to put down $120. I'll have to sacrifice one of the generic FPS games coming out #firstworldproblems