Briefly, here is what my experience has been trying to get a focus motor on my RASA 11.
1. First I used the Celestron model. I spent days on it trying to get it to work. Eventually I gave up and feel it is poorly designed based on all the other forum posts on CN sharing the same type of experience. The Celestron unit seems to work for some and not for others.
2. So then I purchased the Pegasus Astro Focus Cube 2. First there was a lot of confusion on which model of theirs works on the 11. So if you're going to try it, make SURE to get the version that works on the 11 (some web sites say all RASAs work on the same model, but that's not true - essentially there is one for scopes smaller than 11. And one for scopes 11 and higher.)
BUT the instructions had NOTHING about the Feathertouch focuser. It assumed your scope had the same focuser as the 8". I couldn't find anything online and got pretty frustrated that they advertise it as working with the 11, then send you instructions for the 8 (which has a COMPLETELY different focuser. So I returned it...
3. Then I got the Starizona MicroTouch focus motor and hand control. WHAT AN ABSOLUTE DREAM THIS PRODUCT IS! I scheduled the whole day to get it installed, based on all the issues with the previous two focusers I tried from other manufacturers. I ended up getting it fully installed and up and running in 10 minutes. AND IT JUST WORKS!!!
So, if you love it when stuff you buy doesn't work, and requires you to research and come up with your own solutions, then this one isn't for you. Go with the Celestron as you will likely find that it gives you the most grief. Or the Pegasus if you want what is trying to be a better product, but falls short on actually getting you there, and requires that you essentially invent your own way of installing it on a RASA 11. ;-)
But if you want something that just works, go with the Starizona MicroTouch.
IF you do decide to do this, buy the one with the Low Profile Motor.
Admittedly it is more money than the Focus Cube 2 and the Celestron. BUT focus matters SO MUCH to the results in our little "hobby". So after all the drama I had, I was happy to pay more for something so much better.
And, when you buy it, you can choose between the smaller "Shuttle" controller or the standard hand controller which is much larger but has more features as it has more buttons and an LCD readout.
I originally got the Shuttle since I wanted a smaller footprint. But after speaking with Starizona, they suggested I get the larger hand controller especially because you use a RASA with a computer (not with your eyeball). I took their word for it, and they express mailed me the other controller. Now that is great service! They didn't have to do that. By making that suggestion they added more work to their plate, but they did it because they CARE about their customers. And they are right. Even though the hand controller is large, the LCD readout is nice and the ability to control a lot of the functions with the on board buttons is convenient. But frankly EITHER ONE will work PERFECTLY FINE on your scope (RASA or otherwise).
Here is the Shuttle version - smaller controller
Here is the standard version with the larger controller with the LCD display:
So, BIG THANK YOU to High Pointe Scientific who allowed me to return TWO Pegasus Astro Focus Cube's and giving me time to try to get each to work. AND for helping me make the final decision to go with the Starizona unit.
And BIG THANK YOU to Starizona who helped me immensely by sending me the larger hand controller and taking the Shuttle controller back.
NOW I have to figure out how I'm going to AutoFocus. I'll need to post this somewhere on CloudyNights but FocusMax seems to be the standard in the industry, BUT it only works with Nebulosity (which I have but can't get it to talk to FocusMax), CCDSoft, MaximIl and TheSkyX (but ONLY the expensive PRO version with the camera upgrade). But I use SharpCapPro because I love the live stacking and like the interface much more than the others. SharpCapPro has several focus assistants but none of them seem to be "push one button" to automagically focus your scope... So, if anyone is out there and has found a better solution, please let me know. ;-)
Good luck everyone!