Here is the response I got from Alliance. I also specifically asked for a review of the negative feedback from Rigor RV Repair video on YouTube.
"The bedroom slide mechanism that we use is the Accu-Slide system with the motor location below the slide box. We use this mechanism because the slide box has very little weight to it and it sits above the floor and it has shown to be much more reliable than other slide mechanisms such as Schwintek, etc. Our main slide outs in the living area are rack & pinion slide mechanisms which are the most trouble-free in the industry. They are needed because those slide outs support a lot more weight and these slide out mechanisms are tied directly to the frame area to support the weight of the slide out from below. Hope this information helps to clarify things for you.
In regards to the slide out. Cable slides first got a bad reputation when they were used with large heavy slides. This is not the best use for that mechanism. We only use it in smaller shallow lightweight applications and it performs well for us. The cable slide has been quite dependable for many customers and manufacturers when installed properly and used for non-weight bearing applications in a smaller shallow slide. There are literally thousands of them out there in use today without any issues. One service tech’s opinion from only the units he has personally seen is hard to counter the thousands of units that are operating in a trouble-free situation. (Remember he is only seeing those units that have a problem) If any service is needed, the panel inside the bed storage under the bed can be very easily accessed by a service technician. "