Although I have only used KC's other plug-in -- KC S2M+MC Pro -- which is not free. Krum (the author) installed KC Tools on my site when he was doing troubleshooting for me (for free) because I have a couple of hiccups in my install.
I have never have tech support as personal, and as efficient as what Krum provided me.
I do not have enough hands-on experience with KC-Tools to recommend it, but I highly recommend checking it out, because it is built by someone who is really trying to help you out.
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