I go through a ton of waterless wash, it's my wife and I's go to product for getting bugs, bird bombs, etc. off ASAP (we carry it in the cars with us along with a couple of waffle weaves for this purpose).
I have never really done a full car with waterless, but would be comfortable doing it if the car just had dust/fallout kind of stuff on it. Wouldn't be comfortable with anything much heavier.
Rinseless, on the other hand, I have been using for years since Optimum No Rinse (ONR) first came out. It's still hard for me not to accidentally call the Adam's stuff ONR. All you really need is a bucket, rinsless, and about 5-10 super plush microfibers (I use a bunch of "cookie monster" ones I've had for a few years but will probably switch to double softs when it's time to replace them). About my only lament is that it's difficult to properly rinseless (or waterless for that matter) wash wheels and tires, so at least in the warm months I have to do a full water wash with wheel cleaner, APC, etc. to get all the brake dust off the wheels every couple of weeks.
All in all the revolution in emulsifying/encapsulating type products in the last decade or so has certainly made keeping a great looking car easier on a daily basis.