I've tried a few but if you want the laminate to stick to the paper rather than just seal around something these work really well. They even work on my cheap home laminator. I've been using them to make playing cards and when they finally give in it's the paper that comes apart rather than the laminate coming away from the paper.
I bought 100 laminate pouches to protect some posters for an amateur theatre production, never having laminated anything before. It takes a while to slide the poster into each laminate and get it centred but once that's done the laminating was easy and the finished product looked good and survived on the streets for three weeks before we took them down.