i like how the line-x looks. It just has a tough, ruggedness about it that I like. It's dark black, but matte. A few buddies of mine have line-x done on their cladding, bumpers, sliders, etc similar to [MENTION=119859]grantprior13[/MENTION] did. Sick truck by the way.
From all the pics I've seen of monstaliner, it's a gloss black. After reading this thread, I ordered the swatches for $6.50 so I could see them in person and in the sun. I like the idea of being able to roll this on myself for less than $300, but I don't want it to look like black paint that's incredibly orange peeled. I don't mind the texture if it's matte and has a rough look to it. It can add to it.
I'm very much considering this also. The paint on my hood and roof isn't holding up very well right now. I also like that I'll never need to wax it to protect it again.