You probably won't go to Lan parties. Well, you can find there Mini, Medium, Full tower cases. And, believe it or not, more and more are being seen Full tower cases - you can get an idea of why, by looking at those cases: big amount of HDDs, 3 or 4 optical drives, Sound Blaster drive bays, fan controllers, even rheobus kits). Definitely, a 7Kg Full tower case like Tt Armor helps a lot!
As for the tooless rails, no one does it better than Thermaltake. They achieved great performance with their tooless systems. So, if this eases the instalation process, why not offering it? I think Tt made a good choice there.
I don't have personal experience with the Tt Armor (only my vendor - who is also a friend of mine - has already been trying it out and he's really amazed with it; I'll probably go home in 2 weeks and a few days, so I'll then have the chance to try the case), but I have it with Stacker and the flaws I mentioned, they're pretty real. The mounting rails have the problems I mentioned; the issue with the HDD cage, only one 3.5” drive supported, ...well, all that I said above.
I'm not saying Stacker is a bad choice. I really liked it as soon as I got the chance to try it last year. I only replied about Stacker because members start mentioning it. Now, all I'm saying here is that it might not be the best option now that Tt Armor is here. Armor seems to beat Stacker in many aspects.