As a regular P90 primary user, I'd say you should be mindful that its trigger, like real steel bullpups, can be a pain in the arse when it's the original TM spec or one of the TM clones i.e. Cybergun, CYMA, Double Bell, JG, etc.
If you're a stickler for a consistent trigger response, you should consider either buying the TM P90 Plus, upgrading the TM clones with a MOSFET/ETU or if you really want to spend more, there is the Krytac P90.