I have one. I use it for when I'm cutting a lot of MDF. It does help the dust collection work better, but its not a night and day difference. Let's say you get 85% of the dust without it, you'd probably get about 92% with it.
The downside to it is that you have to remove the splinter guard from the saw in order to attach it. For most jobs, I'd rather have the splinter guard in place.
I have one. I like it. But Lou's right, it's not a night and day difference. It makes more of a difference when you need to trim off a kerf-width of material. (I.e., after cutting there is no material on one side of the blade.)
One other downside is that you have to remove it to make a bevel cut. It gets in the way.
Thanks for the info. I guess I'll pass. I was just curious how close to zero dust it would get the TS55/CT combo. I'm extremely happy with my TS55/CT22 now.
Festo(ol) has a "building-materials" saw (AXT 50 LA-Plus), that actually has a completely enclosed saw, above the material , with a brush touching the surface. It looks like it was intended to be used with hardyboard/concrete type materials.It also looks like it would work real well in the dust colection department. But not in the pocket book...
I cut a lot of MDF and wouldn't be without it-I only seem to take it off when changing the blade-but then I don't make many bevel cuts with the 55, I use the 75. In fact, I wish I could get one for the TS 75. If you are on site its really does help with clean up afterwards.