Flight Design offer both the Carb & injected versions on the CTLS range. In the USA since the arrival of the injected version I think that has been the only option chosen.
If you take a browse around
Flight Design CTSW CTLS CTLSi C4 Forum you'll find plenty of discussion there. Warning!!! Ignore any posts there from a guy called 100hamburgers - he's a ******** (I think it's obligatory for all forums to have at least one!)
FWIW I am very happy with the carburetted version in my CTLS ~ 450 hours now from new and still purring along. The weight penalty and extra complication (needs fuel header tank etc) seem too great for the gains claimed.