mSATA SSD upgrade?

[Giganizer300PRO]

I found this Kingston mS200 240GB SSD going on sale tomorrow for only €50. That has to be a good deal for a 240GB SSD. I'm thinking of buying it, but the fact that it's mSATA has me concerned. I've never dealt with this form factor/interface before. I looked it up a little and it looks similar to M.2, but without PCIe support. Some mess with the contacts and electrical connections. I can't really seem to get a good understanding of it.

I checked my MB and it has an mSATA slot, so it would work, right?

I have a new PC planned in a few months (not before Volta releases, most likely soon after) and I was thinking I could just buy this now, start using it right away and then take it over to the new build later on. But I also saw something about mSATA being pushed to the side by M.2. So, does mSATA still appear on new motherboards/platforms or would I need an adapter?

Is an additional SSD really worth it if I already have 120GB 840 EVO + a 2TB HDD in my build? It wouldn't be the main SSD in the new build.

[ATTWIFI]

MSATA is obsolete. The sale is probably to clear out MSATA for M.2 in space or something like that.