Unger liquid I've found is fine, I like it because there is less to edge and detail, I rather imagine that GG3/4 is similar.
These liquids take some getting used to, if you have been used to washing up liquid they take some adapting to.
I've used the Unger Gel too, I think it has its uses, wouldn't want to use it to the exclusion of all else though.
But I doubt I'll ever go back to using washing up liquid.
Regards,
Ian