I have an SL-30 - still the best nav-com ever made, IMHO. But the intercom has some issues. Going by memory:
No easy way to input anything other than 2 mikes. Multiplexing in music, for example, will trip the squelch.
IIRC there is only one squelch circuit; one person talks, both mikes go hot. Twice the background noise (not an issue in a quiet airplane, definitely an issue in an RV).
This radio was built when no one had automatic squelch, and the manual squelch adjustment is hidden several layers deep in the menu - an operational challenge if you need to adjust it in flight for some reason.
But within these limitations it does work, and may be a zero extra cost solution for some owners.