I actually started writing them an email a while ago but then stopped. The message is still saved as a draft though.
We should invite
James from FiiO into a discussion about a gaming product and what features we'd want in the design.
I just prefer a good open headphone to a closed one for gaming, so if it were me I would try and make that work first. A good open headphone will be better than the closed headphones at the price point for gaming as they will have better soundstages. The only closed headphones that have soundstages on par with the better open headphones are ones that cost over $600.
The only con with open headphones is leakage/isolation, but it's usually not a big deal unless there's people trying to sleep in the same room or whatever.
I'd say the MA900 would be a safer choice than the HD598.