Yes, the Amp and Watts outputs are indeed very similar as the stock M8 power supply. I have a bunch of newer Toshiba laptops around me and I noticed all their power supplies seemed to be similar to the one that the M8 uses (spec. wise only of course). So I was searching for something similar, "smaller footprint" that could fit in my side pocket or even back pocket and this one does!
So if you plan on taking your M8 on a road trip and carry as little weight as possible.. you've ordered the right unit that's not too expensive! I just hope that it will last a year or so since many power supplies tend to fail too quickly..