I like my wrmk trim & score, certainly works better than my woodware one did before I binned it. Cutting even on 300gsm has been square, straight, accurate and smooth right from first opening it. I've always cut from the top no matter which trimmer I've used so it hasnt been a biggie for me. All trimmers & guillotines I've had (barring the very first ever fiskars trimmer) has had a join and loses the measurements just where I want to cut so I'm used to that and if I need to cut a5 I'll use the guillotine. Not so keen on having the metric measurements at the bottom.

For me it's a handy little cutter & scorer that comes into it's own if you're taking it on travels or to crops but for heavy duty use I think I'll be sticking with the guillotine & hougie.