You got a very nice deal. The CORE is the predecessor to the ST300, having the same toolset except for the replaceable wire cutters, all steel handles (the CORE has plastic inserts, the ST300 were all metal) and slightly different shape (the older one was more boxy)
The SE blade, long solid Phillips and flatheads are sturdy, tough and extraordinary work tools
It's a discontinued model with many fans, touted as one of the toughest Multitools out there, size is bigger than the Wave and its tools very easy to use and open with gloves one, it keeps working even when dirt and sand get into the tool (something that the Wave and Surge have problems tolerating)
LM Wave, Gerber MP600, LM Core.
Pair it with a SAK that has scissors, or a Micra, and you've got an unbeatable combo for all and every task you may find!