I tried out a H & K Vortex amp at the Ibanez Store in Adelaide last week.
It sounded awesome, but I can't remember exactly if the guy said it was 100watts or not? I remember him saying it was 100, but I'm confused now because another website has said it is only 80 (http://www.guitar.com.au/amplifiers/electric/hughes-&-kettner/HK-VS212.htm)
The amp has 2 speakers and looks like the one in the pic on that website.

Can anyone tell me if the amp is 100watts or not? And also if it is a decent amp?

It doesn't matter. You won't be able to tell the difference between 100 and 80 watts. 100 watts is 2.5% louder than 80. Both are way too loud anyway.