I've been using this site for probably the last year or so!
I really enjoy it for extracting vocals and have used it in tandem with Suno.
Often, I'll get the full song off Suno and then run it through Lalal.ai to extract certain parts or an acapella vocal, and it does a pretty damn good job. Another way I use it is by ripping a vocal from Splice or other samples, even vinyl samples.
It's great to be able to chop up pieces of music, extract just a synth or guitar from your favorite track, import it into your project, and make it new!
It really brings a lot of flexibility to sampling, and the quality of stem splitting is impressive (believe it or not, there's a boatload of A.I. applications out there that now do it).