I like multi-boxing. I've always done it that way since UO, EQ days and I always though it was only way to play MMO.

My setup is straightforward. I have 1 complete computer for each account I play. so when I play

2-box, I play with 2 pc, 2 monitor, 2 keyboard, 2 mouse.

When I 4-Box, I play with 4 PC, 4 monitor, 4 keyboard, 4 mouse.

in SWTOR, I've 2-boxed all 4 sets of base imperial class to 50. Here is my experience.

Powertech + mercenary - First set, and strongest combo. TONS of CC, great AOE makes leveling as well as Heroic 2 super easy. 99% of the times I attack from range so very little effort to play this set.

Sorcerer + Assassin - Second set. Stronger than PT+Merc set in terms of raw power. Just as much CC and AoE which makes doing everything breeze. Only second place because Assassin is melee class so there is whole lot more running in to Melee range. With Stealth, doing Heroic 2 Dailies in Belsavis is breeze.

Sniper + Operative - third set. on paper it looks very good, with CC, Heal and lot of DPS with 2 Tanking pet to soak up damage. Ended up being the most disappointing combo due to lack of easy on-demand AoE, strangely weak DPS for some encounters for some reason, and all in all, most complicated combo to play effectively. Leveling from 30 - 50 was struggle and not fun. Stealth makes up for weak combo for doing Heroic 2 Dailies

Juggernaut + Marauder - Final set. On paper it looked like total loser. I was dreading leveling and it was fairly rough until I got my healer comp (Malavi) early on. After that it was by far the easiest leveling all the way till 50. It wasn't the fastest, and there were lot more button pressing than BH set or Inq set, but absolutely solid combo with zero worries. One HUGE drawback. no CC, which makes it almost painful, to do any lvl 50 Daily Heroic 2.

Currently doing same thing on Republican side.

Future plan, 2-box another 2 account then try to do 4-box (fyi I am no longer fan of 4 box ever since I got burned out of it with WOW)