frame sliders

posting so that I may benefit from experienced feedback on which way to go for the above part
going to be tracking my 937+ starting next month and thought an extra layer of protection might make sense
eventually hope to get a track dedicated bike but want to first make sure i am going to really get back into tracking
regardless, I , have seen Ducabike sliders and Evotech (for twice the money) and, as stated, would welcome your qualified feedback
thanks