Preview.app not to be trusted?

Came across an interesting bug report over at MacInTouch.  A form that shows a price of $40 in Acrobat Reader v4.x and v7.x, but shows a price of $35 in Preview.

Rob Currie says... "I noticed this as I first viewed the form using OS 8.6, and when Abode Reader 4.9 opened the same pdf, I saw it flip from $35 to $40. Further investigation showed that the PDF file had listed $35 as the price when first created but had been changed to $40 by adding a text box with the new price to cover the old price. Adobe Reader 7 shows the alteration correctly, but Preview 2.1 ignores it."

I can't remember the last time I opened Preview without it being by accident. It could have been missing from the Tiger installer and I never would've noticed. I have always found it unbearably slow and of very limited use. This report just reinforces my decision to forget it even exists.

How many of you use Preview regularly? Mind telling me why?