Stretchy CV Gaiters/Boots

[Malcster]

Anyone had any experience of these?
I need to replace 2 gaiters/boots on the driverside (both the inner and outer).
My mate has the stretchy-tool at his garage and offered to help me, using it, and stretchy-gaiters.

Basically, cut to the chase, are they crap?
Will the fall to bits quickly etc?

It's for my Chim, and I'd hate to use bad quality parts on it etc.
I'm happy to buy the real deal, I see racetech do them fairly cheaply.

It's just these stretchy ones look super easy to fit - www.youtube.com/watch?v=oEKY0uFlBpc

Cheers,

Malc