Canon VS Kenko Extension Tubes

Posted this in the Lenses forum, but thought the macro shooters might have more experience with extensions tubes and could probably help too . So I already have the Kenko Extension Tube DG Set (12mm, 20mm, 36mm) but am a little unhappy with how they feel when they go on a lens. They seem to grab a lot more and almost grind against the lens and against the body when they are being put on. So I am thinking of selling these and getting 2 Canon EF25 and one EF12 instead but I have two questions first:

1. Does anyone else who has the Kenko set experience the same thing with the "grippyness"?
   
2. Can anyone with the Canon EF12 or EF25 Mark I or II verify that the Canons go on as smoothly as any other Canon lens?

Canon are much better made and fitting than Jessops and no doubt Kenko but the end results will be the same.

racketman wrote in post #4527730
Canon are much better made and fitting than Jessops and no doubt Kenko but the end results will be the same.

Yea thats what I thought. I dont know, I realize they are functionally no different, but it just bugs me how they feel going on and coming off. I think I am just going to sell them and get slowly get the Canons.

Mine feel the same as what you describe, but to me it's worth putting up with for the price difference.
Hard to justify spending that extra money on air.

For as much as I use the tubes, Kenko is just fine.

I have the kenko tubes and they are fine and work as they should.

ben_r_,
I have Kenko tube set and they go on and off just like my lenses. No rubbing or friction ("grippyness") difference then my lenses.

John_B wrote in post #4530052
ben_r_,
I have Kenko tube set and they go on and off just like my lenses. No rubbing or friction ("grippyness") difference then my lenses.

Huh, well maybe mine just need a little more breaking in...

Functionally equal as others have mentioned, but there are times when the sturdier Canon Tubes are a must.
We don't tend to use the wiggly Kenko's when shooting with large super telephotos for instance. This is where the Canon's sturdy build is a must.

I have the Kenko tubes they fell nice and tight which is what you want with the lens hanging on the end of them.

Kenko here, fine with build. Work great. For what I get from it though even they seemed pricey. Canon? Silly.

My dad has the canon EF12 and the one thing ive noticed is how tight it seems to be when getting in on and off the camera and also when putting lenses on it. I was a bit worried about getting it stuck on the camera when i first tried it.