Reply to using SL1 & SL3.. is itch worth it? novation twitch?

i'm currently using SL3 with my technics m5g's and denon 3500's with SL1. i've been using SL for about 4-5 years now. . i was wondering if itch is worth getting? .. i'm planning on getting a small controller (probably novation twitch) so that i can just play around with it on my computer desk rather than setting up 2 decks and a mixer. are there any benefits/pro to using itch? ... being a scratch live user, am i going to be disappointed in itch?

and if any one has the novation itch, how do you connect it to an output? rca cables to a mixer? ... if i ever do take the twitch on the road would i be able to use SL on 2 channels and ITCH/twitch on a third channel?