I have a rotary blade sharpener. (Got mine at Joanns with a 40% coupon)
I've had it for years and it still works great. I usually take my cutter apart and sharpen the blade, clean it off and put a dab of oil on it after every few cuttings. You'd be surprised how well it works after you do that and it just makes cutting so much easier. It is a nuisance to take the rotary apart but in the long run it's worth it. DonnaCee