Yeah don't wait any longer, they simply work and saves alot of time!
I think the mitt or the towel and the sponge are all good to have. The sponge and the towel in addition to the Mitt would let you get those hard to reach areas like under door handles etc. Or thin areas on a pillar or getting around trim.
I didn't try the discs for a da polisher, as I don't think liquid and da polisher is a good idea for me. However everyone says it's even faster to use, but I would think it would leave marring.
What's sad is I have a ton of clay on the shelf .. I mean alot of clay that is just going to sit there... Pinnacle Ultra Poly, Megs, Mothers, 3M Optimum. As you needs differnt types of clay for different uses. Fine, Medium and Aggressive.