Thank you everyone for your input, much appreciated!
I also noticed that it takes some practice using the Dexter. It gets better when I have to cut several mats in a row, but better don't ask how many times I screwed up... Oh well...
Luckily I found a shop who has the 350-1 model on sale at the moment, and I was also given a discount voucher by them, so in the end, the 350-1 cost just 11 Euros more than the 301, which I would have taken otherwise. Now I look forward to working with it - some prints are waiting to be framed
Thank you once again!