Hi, I have been scrappiing since 97. I have always used a Fiskars trimmer I have never had any problem with them in all these years I never have them cut crooked Donna is right..they have awesome customer service I am using one of the wire ones now & love it but before that I just used one without the wire I love having the wire. it shows exactly where to cut so I am not messing up a beloved piece of paper.
You're going to get almost as many recommendations as there are scrappers! Everyone has their personal favourites.
Mine is the EK Success Rotary, because it's robust, light-weight, it folds up for easy transporting to crops, and you can get lots of different blades for it. A regular cutting blade lasts a long time (I'm on my 3rd in 7 years) and the replacement cutting mats are inexpensive and can be turned 4 ways for maximum use.
Love the Stampin up trimmer. Haven't tried the rotary addition yet. For heavier cutting I also have the Fiskars Pro-Cision. It's a little bulky for travel, but it does fold easily and it's commonly folded in half when using it. Blade is self sharpening (I think someone said that), so nothing to replace. Howeve, it's a bit spendy(someone prob said that too!))
I have a fiskars folding trimmer with LED, and have a few complaints about it. The blade is terrific, sharp cuts, very good. (unlike small fiskars, where the blades tear and chew the paper awfully). The problem is that I use it in folded position a lot, and it doesn't have enough support when folded, so it dips. Weird. Also, because of the folding, the ruler marks are missing around 6" mark, so you have to guess. You also cannot cut, say, 1/8 inch, again because there are no marks. Other than that, it's heavy but it's folding, so it's easy to store. I put it under the desk, lay everything out, then pull out the trimmer, make the cuts, and put it away again. And use a small 5*8 guillotine trimmer for smaller cuts (e.g. trimming photos or mats).