I have had the Shelandy dryer from Amazon for about 1 1/2 yrs. $70 and it works great. Heat on or off plus variable speed dial and several nozzles. I can bathe and dry Poppy, my standard, in about an hour. Great time saver and it is plenty powerful too!
I have a K-9 III professional grade. I’m happy with it. I had always planned on grooming my spoo, but if you are looking for cost/benefit, professional grooming of a spoo is expensive. I’ve more than paid for the cost of equipment with savings. Perhaps that means I need a second spoo for even more ‘savings!’