$75 more than the original TS-453 mini, but there are some updates.
Compared to the older one -
You get a remote
4GB ram instead of 2GB ram
4k video instead of just HD video
Newer cpu supports more encryption standards
Newer cpu better for video transcoding
Lower power consumption
4 USB 3.0 ports instead of 3
Otherwise it’s mostly the same. Basic file transfer performance ought to be nearly identical to the old version unless you’re transcoding or using the additional encryption features of the new unit.
I got one of the old ones, and based on the new features and the price of these new on Amazon, this seems like a reasonably good deal. A woot closeout on the old model for a lower price would be nice though (hint hint).