I've played other games similar to Invasion, I will have to say I really enjoy invasion. I do have a recommendation though for future updates. Would it be possible to add in, in a sense a "town hall" or Guild Barracks if you will, one of which will allow the guild itself (not the members) gain power with research and troops. Making it also a target during PVP events. Forceing guilds to have attackers (basically what we all are now) and defenders, the ones who stay at base (near the guild barracks) and support it from attackers. I feel it would really open up a new world of game play for invasion.
Just a thought
Thanks,

MacMayhem, zone #53 HELLS LEGION IX [8IX]