Hi cool- and warm headed people!

I've been lucky enough to get a Panasonic CS E12CKP for free a month ago . I haven't installed it yet, as I've got second thoughts about its age.. The system has never left the boxes, but I am worried that it might be a waist of money to have it installed, as the technology moves pretty fast.

Any ideas on this? I think the COP value is 3.7.

Also would it be hard to install? I'm handy with tools, but would for sure stay away from trying to pressurize the system myself...

Thanks a lot in advance!

Brgds,

Kristian
Wanna-Be-Inverter