Any know "Travel all Russia" agency?

I am thinking of taking the RS tour which ends in St. Petersburg. After that I would like to make my way down to Moscow and see a few things on the way. In doing some research, I came upon the "Travel all Russia" agency which has a cruise down the Volga and meets my requirements. I did some searching on the net. While most people find it a decent agency, one or two were pretty unhappy with them. Does anyone here have any information on this agency or their St. Petersburg to Moscow cruise? TIA

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