The Score Pal tool was a great investment! I love it! It was expensive but after preparing 200 card kits in the last seven days it was invaluable. The score is straight, smooth and consistent. It handles 12x12 paper which just adds to it's versatility. My last tool was a scoring blade on my paper cutter. A little wobbly and not always straight. The scoring grooves provide all the popular measurements like 4.25, 5.5 and a bunch more. The scallop card had two scores at it was very fast to get them both done!
I would highly recommend it to anyone who makes cards on a regular basis.