[Darvin]

My only concern is that it looks like it would be difficulty, if impossible, to differentiate the three different impalers at a distance. The upgrades are rather small and difficult to see. I think you need to do something to make that more obvious at a larger scale (maybe add a colourful section to that shoulder pad to make it stand out, and some spikes or other stylish shapes to the helmet to make it stand out. I notice you have the spikes on the added to the slayer to make the helmet more obvious; something along those lines would be good. That said, the shoulder-pads may also be difficult to see at larger distances.

I think these look absolutely awesome, and the idea of having specialized upgrades may work out quite well.