I own a large number of Griot's Garage car care products and have always been a big fan.  This kit is no exception, it gets the job done, albeit at a high price.  The kit includes an interior cleaner, a leather cleaner/conditioner, high quality spray bottles for both, and a set of four micro-fiber towels.PROs------------------------------------+ Kit works well, as advertised+ Griot's spray bottles are the best+ Leather conditioner leaves no residue so you can sit on it right away+ Generous-sized towelsCONs------------------------------------- Minor linting from towels (very very minor, but there is some)- To do two cars, I think you'd need 8 towels (not 4)INTERIOR CLEANER------------------------------------The Griot's Garage interior cleaner has a bubbliness to it that hints at its cleansing properties.  I sprayed the cleaner directly onto the black rubber and leather surfaces of my two cars and then wiped with the towels.  My cars are always  fairly clean and, I think distilled water would have worked just as well.  I'm pleased that the cleaner air dries and leaves no streaks, even on glossy surfaces.  The end result was a spectacularly clean car interior that my wife commented on the next time she drove the car ("wow, clean!").  This kit includes the typically excellent Griot's Garage sprayer.  The pump is well built and will last a long time, even allowing for refills.LEATHER CLEANER/CONDITIONER------------------------------------------------------I later applied the leather cleaner/conditioner to the leather surfaces of two cars.  Both cars have smooth black leather and in each case I couldn't tell any difference after applying.  My assumption is that enough conditioner is soaking in to keep the leather fresh and supple over the long haul.  That is hard to judge after just one use so I'll keep my eye on this over time.The leather cleaner/conditioner leaves behind no residue; this is great because it means you don't have to worry about ruining your clothes after using it.TOWELS------------------------------------While the box that this comes in proudly claims "made in America", the four towels are clearly tagged "made in China".  That said, my experience with Griot's Garage microfiber has always been positive and these were quite good for what essentially amounts to rags.  The towels are generously sized and I used one towel per front seat for cleaning, and one towel per front seat for the leather conditioner. Unfortunately, since the kit only includes 4 towels, that means I can only do one car at a time.  I'd prefer to have 8 towels so I can do both of my cars.I was doing some hard scrubbing and the towels coughed up a couple of small lint balls.  This was so minor that I was hesitant to mention it.  But the guys that I know that buy products from Griot's Garage have high standards and they would have been angry to see green lint on their black carpet after doing the cleaning.  I'm washing the towels and will report back if the linting improves or worsens.SUMMARY------------------------------------This is another very good product from Griot's.  I only gave it 4 stars because there was just enough lint from the towels that some true car care fanatics would be upset.  At this price, you have to be perfect to get 5 stars.  But this is still a really nice kit and makes a very good gift for someone that likes to take great care of their cars.