Well I have had some very good luck with them!!
I took out a perfectly good working vert because everyone told me to buy a Dynamic. which I did, it changed nothing ran same numbers mph 60ft
I beat on the vert for 4 years, sold it o guy who ran it another 4 before he sold it, so no telling where it is now,
I have no issue with them !
same for the Fairbamks! ran great on the street/strip for me