Using a single device certainly makes the game more challenging . Dual devicing is certainly more helpful for your respective clans .
I think the guys like donko or tyrant are just nuts , honestly I have a hard time dualing , using more than 2 would make my head spin and I think it must require lots of skill if done properly.
Eliminater, it took me a fair old time to be able to dual a druid well, then when I got bought a new ipad for Christmas I thought great I can triple log now. How wrong u was...
I took literally ages to figure out how to level my ranger with the druid healing and my warrior keeping up with the fight going on and causing extra damage. It's doable but hard.
If I am grouped with a levelling partner I just leave the warrior because the fights don't last long enough to even hope to keep up.
The best I have one so far is keep levelling my ranger and heal with my druid while my warrior was fighting falgren, that is a proper mind ***. Haha