Storage upgrade for ExpressCard machines

Here's a nice option for older machines - SSD, bootable, hot-swappable (given you haven't booted off it ) decent price.
https://www.indiegogo.com/projects/thinkmods-expresscard-nvme-adapter#/

 

It's not bootable on a majority of machines, and limited to ~4Gbps. Still a nice upgrade for people with the slot, I've actually talked with the guy a fair bit through his struggles, he was also planning something else I forgot about but I remember it being really cool.

Edit: meant to say the SSD itself is not bootable, requiring the use of Clover or similar.