Hey Gunthaa,
I'm also in the process of making this same decision (at present) on
"spray-in liners" for my '04 D/C. I'm lucky though... in the fact... that I have two friends in the business. Unfortunately, both use a different product... but... both are good spray-in liners. One is
Speedliner and the other is
Line-X. After listening to their opinions and researching each (for myself), here's what I've found.
Speedliner http://www.speedliner.com/usa/main.html
Here's a link for how
Speedliner is applied:
http://speedliner.com/usa/installation.html
This liner is the stronger of the two (BY FAR) with a 4,200-4,800 psi tensile strength. It also offers a stronger tear strength at 865 lbs/in. To further improve
Speedliner's tear strength, a high-tech fiber of
Kevlar can also be added. In stark comparison... the tensile strength for
Line-X is only 1,800 psi and its' tear strength is only 304 lbs/in.!
Speedliner offers this info right on their website, while
Line-X does not. (I had to make 2 seperate calls to just get this info over the phone!) It kinda makes me wonder if the reason
Line-X won't publish this info is... because... they
"know" their product isn't quite as strong as
Speedliner?

Anyway,
Speedliner is also sprayed on cold and therefore takes a little longer in application time, but from seeing the product first hand, it's also sprayed on
"thicker" than what
Line-X is... and that... could also have some bearing as to
"why" this product is also stronger. Also,
Speedliner has a much
"smoother" texture than the
Line-X product. I'm sure the first thing someone would say to that is... if you're hauling anything... it'll slide all over the bed. Well... IT DOESN'T! It'll also make it easier on your dog's
"too-sees" when you take him/her for a ride. Of course that only applies
"if" you have a dog and allow him/her to ride in the bed.

Finally, one feature that I DO like with
Speedliner is that its' product will not fade. I'm sure you've seen some liners that turn a
chalky white after a few years of use.
Speedliner says (as does my friend), that won't happen with their product. It's a good product... but... so is...
Line-X 2 websites:
http://www.goline-x.com/prodinfo.asp http://www2.line-x.com/
Here's a link for how
Line-X is applied:
http://www.goline-x.com/process.asp
This liner is more widely known and I can honestly say, I see more of this product on the road than I do
Speedliner. I think the initial
cost and the shorter application time have a lot to do with
Line-X being more frequently used by
"John Q. Public".
Line-X doesn't offer any info about its tensile or tear strengths on its' website, and... only... after 2 phone calls was I able to get that info by phone. The tensile strength for
Line-X is 1,800 psi and its' tear strength is 304 lbs/in.! Again... it's quite a bit
"less" than
Speedliner! Otherwise,
Line-X is sprayed on hot, and the product therefore
"cures" much faster. It's also sprayed on much
"thinner" than
Speedliner. The applications I've seen (first hand) are just barely a 1/4" in thickness!

The
texture of this product also has a little more
"tooth" and offers a rougher feel on the surface. I can't say whether there
"is" or
"is not" an advantage to this, so I'll let you form your own opinion on that.
I can however, offer you this bit of info on a more
"biased" level. The friend who uses
Speedliner bought into the franchise...primarily... for using the product on his
"fleet" of pick-up trucks, 18-wheelers, and the walking platforms of his cranes. He only does the
Speedliner bed applications as a side business and makes just about $25 off each application. He's VERY
meticulous with his business (in general) and heavily researched
spray-in liners before deciding to go with
Speedliner. If you’re interested... here's his web site:
http://www.edwardsinc.com/
On the other hand, my other friend (who uses the
Line-X product)... it's basically... his
"livelihood". He has a thriving
Line-X franchise, here in the local area, and does a great job applying the product.
Both liners offer a lifetime warranty, so that shouldn't be a deciding factor. The only real significant differences are in the
"tensile" and
"tear" strengths for each. BTW... these figures ARE ACCURATE! That said... you just have to ask yourself... will you ever reach the
"failure point" for the tensile and/or tear strengths of each... I knida doubt it. I guess what it boils down to then... is what looks best... to you... and... what you
"think/feel" are the better of the two liners. At least that's what I think it's going to come down to for me.

Luckily... neither of my friends actually
"know" each other, so whomever I chose, I won't make the other mad.
In any case, I hope this info helps...