I just really started to get into the beta and thought I'd seriously give the Key+Mouse combo a try.. it's ok for some things, like general flying around (docking, navigation etc) but for combat, it just doesn't have the responsiveness needed to keep up. I'm sure with practise it might be but after having my ship handed to me for the 3rd time without really scoring much, if any, damage to the pirates I've decided that at this time, K+M is not up to the task. Maybe there will be some kind of additional flight assist later on for K+M combo but for now.. it's not enough.
I do own a Saitek X52 from years ago.. but you know.. I have limited desktop space and a small child running around who likes to grab things from the tops of desks etc.. so I won't be going to the trouble of getting it out of the box. Maybe in the future, when I have a bigger desk and a separate room just for my computer where I can lock the door etc.... maybe.
So for me, it's going to be the XBox Controller for Windows. I've not yet flown with it but I found it out from the storage and it's all plugged in ready for my gaming session today.