I have that same low profile Harbor Freight transmission jack and I like it a lot. I used it to remove the manual transmission from my Audi without any issues at all. And FWIW, the manual transmission on my Audi is huge and heavy because my Audi is quattro and the transmission contains the front differential as well as the clutch assembly.
Some people might say it's really a transaxle and I guess by definition that may be true, but the car has a longitudinal engine and transmission, so it just looks like a large RWD transmission. And the fact that the clutch and pressure plate stay with the transmission when you remove it also makes it heavy and a bit strange compared to "normal" cars.
Anyway, it worked great for me and I think it was a good purchase.