Yes they are improved and easy to fix.My second Mighty Mule was a significant redesign from the first one, and it is more heavy duty. It also slows down the gate operation at the beginning and end of the cycle to reduce wear.
If you haven't already, it might be worth looking at the new ones to see if it's still the same product that you have. The range for the remote is about the same, though.
I have two and one I've replaced parts a few times due to wear and lightning.
What I usually do is buy another one and use parts from it and since it's already installed it is quick. That leaves me with more parts for future repairs.
They are basic. There's a board and an arm and am antenna. The arm is a motor screw. It has a wheel that has a spin counter using ir sensors.
The board is pretty simple but well built. Has fused protection and easy to add options. Since they are sold at home depot you can repair on weekends and nights.
There are probably better systems out there but hard to beat for the price. I have quite a few parts saved up for mine. Probably enough to rebuild a complete opener.
Right now mighty mule has 10 percent off everything. Just got an email so that helps.
The car built in remotes and other universals will work with them also.