I don't have a problem with any of my 7 trimmers. I do have to do some creative adjustments on a couple of them, but I get straight cuts.
My knife is my most used cutting tool. I buy my blades by the hundred for about $20. Model train and airplane shops or on line. I also bought a small, suction cup blade sharpener at a booth at the fair … works great and extends the blade life.
I feel that any trimmer is not perfect (just like a man). My Fiskars Pro Trimmer (self sharpening rotary blade} makes straight and smooth cuts every time...But it is difficult to see where the cut is going to be made unlike the portable trimmer mrsmiller mentioned above. The portable trimmer lets you cut inside the paper where the rotary does not. I go thru blades at an alarming rate. I use a lot of glitter paper and that will dull the portable's blade FAST. Guillotine cutter are good but they have the same issues the rotary trimmers do. They are bulky too.
I'm glad to hear that I'm not the only one who has tried trimmer after trimmer, all to no avail. I've got my eye the Premium Paper Trimmer that WRMK are releasing next month. It's not cheap but it looks like it might be a better value than the plastic, rubbishy ones I've been using.
I agree with south girl and the rest ! Lol I bought a simple fiskars trimmer it lasted over 6 years usually worked good the in 2017 assembly line Xmas card making the wire broke I continued to use despite the wire missing for many months then I bit the bullet and went here scrapbook.com and bought ( among other things) lol a Kaiser cutter trimmer for under 40 bucks it finally arrived with zero instructions!!! I opened pulled out and used it ...no cut ! Tried again ..read again used it ...no cut ! Do days later I called scrapbook.com spoke to Paula explained the problem and she goes " there are no instructions with this product you'll have to return it" I'm like ..WHAT,?? I just got it ! I even had my craft guru -- jr my boyfriend attempted to make it work ... No cutty! So it's in the mail as we speak! Don't get me wrong I love scrapbook.com it's actually a love ! But there are no instructions with most of the product ...why? So yeah they're my babe too ! Lol