I am a car fanatic, and I have used practically every leather care product on the market as well as a host of Griot's products.  I will review each of the components individually.  Overall, my score is 4 stars.First, I'll say that one of the best features of Griot's products, in general, is the packaging.  For example, the Interior Cleaner comes in a nice wide-base round bottle with a good sprayer (more later).  When you are detailing a car, I can't stand cheap bottles with junky sprayers that are thin and fall over easily.  Often, you are carrying multiple things in your hands and need to rest the bottle down on something and having it fall over all the time and dribble out is annoying.  All the bottles are very high quality and clear so you can see how much is left and where the end of the pickup tube is.This kit contains 8oz of the Leather Care Spray and a separate pump spray nozzle. I was quite surprised by the Leather Care Spray.  It is an excellent regular-use cleaner and conditioner.  It leaves a very nice leather smell as well.  I would recommend it for leather that has been well maintained and in good condition.  What I REALLY like about this is that it does NOT leave a greasy, sticky mess behind like most other leather products.  A little goes a long way.  If your leather is in bad condition, look for something more like Leatherique.  The pump spray delivers a well-controlled fine mist, although sometimes it felt like it got stuck and I had to press extra firm.This kit contains 35oz of the Interior Cleaner and separate trigger spray nozzle.  Like the Leather Care Spray, both bottle and spray are packaged separately and sealed so that there are no leaks.  The sprayer is a very high quality and delivers a large volume per pump, but I found the spray pattern to be a bit large and often this led to overspray which I had to wipe over previous areas.  Like the Leather Care Spray, the Interior Cleaner is a mild, regular use product.  I used it on everything from leather, vinyl, to plastics, to even touch screens.  It was fairly all purpose and cleaned mild dirt well.  It did not remove heavy duty stains like some sunscreen on black leather, but that was to be expected.  This is not a miracle product, but an everyday maintenance product.  I felt this cleaner is a bit on the expensive side, but you can also buy a gallon refill bottle.  If you are really cheap, you can make your own refill and just use the excellent bottle.  It has a good amount of surfactants and did not leave streaking.Lastly, this kit contains four 16" x 16" green microfiber towels.  I would rate these towels as a "basic grade".  I have a LOT of much higher quality ones that I use for paint waxing, etc., but a good basic towel like this is better suited to the task at hand.  Can't fault them for that as it would just make the kit more expensive.  I also have much cheaper MF towels.In sum, this is a good kit for routine maintenance on well-cared-for interiors, and the bottles are nice and Griot's makes larger refills for the leather and cleaner sprays.  If you are expecting some super heavy duty miracle worker products, then I think you will be disappointed.