Dang. I made sure it was the Proline version, not the crap Sportline one too...
The only P90's that are available to me at this time are the CA Proline versions, and the King Arms one. Of the around 20-odd reviews I read across the interwebs, the bias was towards getting a CA Proline version simply by virtue of their solid full-metal gearboxes.
The amount of literature regarding all the P90 variants I read up on all had a similar theme: each brand of P90 was good, but each had one unique flaw... so essentially I ended up having to pick the lesser evil, lol