At the end of the day the sponsor has integrity or they DON'T.For some syndicating is how they live.

I guess what we'd like is a program that is user-friendly/ intuitive, can keep easy track of payments, maintenance work orders, and if it can possibly communicate with Quickbooks or tax software or can at least compile things in a format which is easy to integrate into tax accounting that would be great.

Structural integrity: One of the most important considerations is the structural integrity of the garage.

I'm totally fine paying them if they're good and can provide value to me, but I find a lot of them lack either integrity or capability, sometimes both. 

I believe appfolio will allows for showing integration in addition to all of the above.

Integrity is something that is earned, often when times are tough.  

For example, fixing a leaky roof early can prevent water damage that can cause mold growth and compromise the structural integrity of the building.

Since the QI can only perform your 1031 exchanges most will expand geographically to scale rather than trying to integrate with a legal or accounting practice. 

Been doing it many years with experience and integrity.

One possible PM option seems to be is RentRedi, where they seem to provide an integrated vendor network (Latchel) for maintenance activities.