wasn't there another thread about this a while back?
I've got this-
https://www.harborfreight.com/pneumatic-air-operated-brake-bleeder-with-auto-refill-kit-57057.html?_br_psugg_q=brake+bleeder
I use it for sucking all sorts of fluids from diff gears/aoc haldex units/ etc on newer cars that don't have drain plugs. Also use it for brakes.
It has a fairly heavy duty sucking pot, and some refill pot that you are supposed to put over the brake reservoir to refill the fluid. I find the sucking pot good, and the refill pot not so good (it doesn't fit into the spaces on any of my cars, but oh well- I like to manually add stuff anyway)
Overall, works fine. The big thing is that it can suck so much, it will pull in air at the nipple so it will look like you are still pulling out air bubbles from the system. The key was to have the clear tubing go straight up from the nipple so once the vacuum is off, gravity will let you see the nipple is totally in fluid before you tighten it back down.
That said, when the other thread was here, iirc- other people jumped in with totally cheaper and/ or better ways to do things.
edit- On my last oil change, I even used it to suck the oil out of the engine through the dipstick. Worked well, but, I couldn't get the tube in deep enough to get the last couple of quarts oil, so I went ahead and pulled the oil plug anyway- but that's not the vacuums fault. I was impressed.
Overall, it's been a good purchase.