Your space
Measure wall to wall, inside. For height, measure to the lowest thing overhead (door rail, light, opener) — not the ceiling itself.
Stand under the open garage door — how far down does the rail hang below the ceiling? Usually 10–14 in. Get this one wrong and every verdict below is wrong.
Not sure what to buy?
Tell me what you want out of it and what you can spend. I will pick a setup that actually fits the garage above, in the order most people should buy it.
Equipment
Pick everything you're considering — over-picking is fine, that's the point.
Add your own
I have 0 models so far. Grab the dimensions off the spec page and I'll run it through the same checks.
Height is optional, but it is what catches the ceiling and the door rail. With clearance ticked I add 12" of working room on each side — if it needs more than that (a bar sweep, a treadmill run-off), build the extra into the numbers you type.