I just finished a 6 month long campaign of this game. Absolutely wonderful and LUMEN is just perfect for this setting. It still has many of the pitfall of the LUMEN system and it's a little bit bland on the visual side, but it's the perfect Mech game in my opinion. It just works as both a power trip and intense combat game.
Concise, Easy to comprehend. Easy to play rule system. A cleaner option that playing LANCER.
Tactical mech combat without overbearing rules, which lets your mechs do all the overbearing!