My biggest gripe I am having about Mach2 is it no longer supports through the mount cabling for external cables. I love having to route several external cables through the mount for my A-P 1100GTO and I NEVER EVER have to worry about cables getting caught during imaging session. I know that there are ways around it if the mount does not have through the mount cabling using external cables but I NEVER EVER think about it because all of my external cables are routed though the mount and it's a huge life saver.
I believe A-P advertisement of "through the mount cabling" at their web site for Mach2 is a little (or big) misleading and I've asked A-P to re-word their advertisement so that future Mach2 owners won't be somewhat betrayed because A-P also advertise A-P 1100/1600 through the mount cabling as well meaning that external cables can be routed through the mount as well but it's not possible for Mach2. A-P need to say that additional external cables CANNOT be routed through the mount.
What A-P meant about "through the mount cabling" is that USB3 and power cables are already routed internally so that you can connect 12VDC and USB3 cables externally to the mount so you may have to redesign your external cable management a little bit. This may mean that you may need to have power distribution box (i.e. RigRunner) and USB hub at the scope(s).
Bottom line, I highly recommend ALL of A-P products and I will continue to buy their products.