"Dadonator" is Infinity's dado stack. Gets good reviews. I've not used it, but the few Infinity cutters I have used have been very good. The Oshlun I had was very good for the money, the orange CMT set is my daily user (got it for $40 at Lowes--was scuffed packaging!!) and I like it. For when it matters--exposed dadoes--I have an Amana set that I got a great deal on as well, much cleaner cut than the CMT and flatter bottom.
Having used those 3, i'd call the Oshlun a great value at retail price. The CMT I would buy at full retail if I had to replace it as well, but i'd probably buy the Oshun over the orange CMT. The Amana is the best of the 3, but i doubt i would have ever been comfortable paying full price--not because it's not worth it, only because my skill set the rest of the project usually makes the exposed dadoes look like the best part of the piece!! ("Honey, that cabinet just won't fit our décor. But the DADOES are incredible!!")
earl