The Exploding Ligum Boot Slider in the U-Tube vid has a recall on it.
In the text the allude to Fake Boot Sliders.
http://www.ligum.co.il/boot%20slider.html

In any event if you compare the pic of th Dorman tool with the pics on the U-Tube you see that they are constructed differently; even though they may function the same.

amazon.com
 

Astoria 2000 FB5000PK Rapid Flexx Boot Gun with Air Reg. Fitting
Other products by Astoria 2000
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Price: $277.86

In Stock.
Ships from and sold by WescoTools.

http://www.amazon.com/Astoria-2000-FB5000PK-Rapid-Fitting/dp/B000O3N5LO/ref=sr_1_32?ie=UTF8&s=automotive&qid=1271258232&sr=1-32

My Astoria isnt the only one for rent here...:)

Can someone tell me where I can buy the stretchable CV boot? I don't want to spend 300+ for a gun for one boot. There is one that has a cone I am looking for.

astoria has two flexx guns also... their cheap one looks MUCH better than the dorman... of course their cheap one is over twice the price of the dorman...
that exploding thing kinda creeps me out...

what's the deal with the two different type of boots? high temp? silicone or standard? which do you think has greater longevity?

Note
 

the video is a Ligum Boot Slider CV Boot Tool, NOT the Dorman tool.

Exactly; the two Guns have a superficial resemblance and function the same but obviously are constructed the same.

With the exception of the spreadng Fingers and the Finger Pins the Ligum Boot Slider looks like it is 99% made fo Plastic. This is different from the Dorman tool.

Proper fitting boots can be picked up from Astoria.

My Astoria is a model FB-5000.

A friend of mine has a 240D and bought the Dorman gun to reboot 2 axles. He ripped 2 or 3 Dorman boots doing it (but he did), so I don't know if there's an obvious issue ( I didn't witness it).

I haven't tried the gun yet, but I did manage to reboot 2 of 2 myself with a funnel (had some help, of course)

Which is the longest lasting boot and how much does it cost? When doing the boot, do you heat it up in an oven to soften it first? I have a small crack in a rear axle boot and instead of replacing it, I'm thinking of sealing it up with some Urethane dry suit repair sealant. Anyone try that?

CV Flex Boot Mercedes W123 - YouTube

Axle Boot threads
Axle Boot threads - PeachParts Mercedes ShopForum

Doorman Uni-Fit CV Boot Air Tool 614-030
Doorman Uni-Fit CV Boot Air Tool 614-030 - Google Search

The Longest lasting Boots
 

Are from Mercedes.
They last EVEN Longer IF you apply 303 Aerospace regularly.

BUT you're not gonna be able to use any of those "Boot Guns" on them.

(Old Fashioned,Pull the Shafts out of the Joints,Clean and re-grease the Joints,
Install the NEW Boots.)

I loaned my Astoria gun to whunter.

I learned a long time ago, that the proper safe tools are cheap insurance, as anyone who has had a spring compressor fail will also tell you.

Dorman
 

We did 4 axles with the Doman flex gun. Two axles on the car and two axles off the car.
We purchased the gun at AutoZone 614-030. It was so easy, will never go back to the old way of disassembling a shaft to replace a boot. The tool is lifetime guaranteed so there is no worry about damaging the tool.
Doing the axles on the car was a little more difficult than off the car. With the Dorman tool I had to push to get the boot over the large axle can on our Mercedes shaft, even when the tool was fully extended.
On the car there is limited room to access the axle so I accidently bumped the brakes when pushing the tool on the axle and the boot split. I complained to Dorman and they set me a replacement boot for free. Covering the brakes and hubs with cardboard with probably help to prevent rubbing up against them.