The A-150 Dual CVS is nice, but this takes switching to the next level. In addition to being able to choose which direction the switch functions (1 to 2 or 2 to 1), you can have groups. You have the choice of contolling with a gate or a button and being able to either toggle or hold (level). With eight of these the unit cost per switch is very attractive. I use it virtually all of the time.