i installed blasto dry units in 6 bays last spring (march-april). i chose between the blasto dry and the air shammee without ever having seen either unit in person. i don't know why i picked one over the other, so you'll have to just make the best decision you can. i'm very happy with the blasto dry. in all fairness, the diskin units could be just as good or better. i'm in no position to speculate. the "air knife" does not have a fan in it. it does use only two motors. the blowing power is awesome. the drying power is up to the customer. i can easily hold the handle with one hand on hard to reach places, but two hands is preferable. as with the wand while using high pressure, some customers will not be able to use one hand. the amount of surface area covered by the air knife is large, making it easier to dry the car. without using wax/clear coat you can dry the car. with wax/clear coat you can dry the car faster. if you want the car to be 100% dry, it will take several minutes. i take about 4 or 5 minutes on my accord, but i'm not racing the clock. many cc users will also not be racing the clock. customers can use it for as long as they want or don't want to. some just finish their remaining time on the clock. some go all out. it is popular. any day that i have customers, i hear the units being used. yesterday someone dried their carburetor out and got their car started. it has been very good for me at that specific location. every location/clientele is different. many die hard cloth dry customers don't touch it. some customers use it, then finish off with the cloth. i give time to every motorcycle i see. some like it, some don't i'll put time on the clock for anyone who asks about it, even now one year after installing. if you have any questions about the little things concerning day to day use, email me or send a pm. i'll be glad to share what i've learned.