It works great! A little slow, but when I filter it's 500ml per filter and usually 1L batch. So smaller batches will be pretty quick. I just went to harbor freight and bought a couple kits. Give it a few pumps and it holds pressure for a while. I'd rather it be a little slower but more controlled. With a vacuum pump I feel like I have to babysit the shit out of it and feels chaotic sometimes.@Heavy Iron isn't you say a brake bleeder kit would work for a vacuum pump with a bottle top filter?
Another method I thought of in the beginning when I was a newbie was buying a sterile media bottle. Use a bottle top filter and filter directly into that. Use 60-100ml sterile syringe with either a long ass needle or sterile surgical tube and suck up the whole 100ml batch at once. Then put into sealed sterile vials.