I use the basic AR/AP and not the advanced one.  I use the basic depreciation also.  The payroll system is all via Aatrix so I guess I don't think it's too complicated but I've never used QB.  They will do a big demo with you to walk you thru all the functions/features I'm sure.  They have on-line classes you could watch I would think before purchasing to see the look and feel of certain areas.