I did the scandi and russia tour in May-June. I have a travelogue at
www.giraffegirl.net/scandi_and_russia.htm. . I thought it was a good tour but very different from the european circuit.
In Scandi it is a cross between a concept tour and a camping tour - you stay in cabins and have a supercook. You have to help with cooking, cleaning, packing the bus. The food was pretty good though and the campsites were amazing (or the locations were). . There weren't any other tours to run into in either Scandi or Russia, so it's just you and your staff. My staff in Scandi was average, but they were great in Russia.
But Scandi was gorgeous and Russia incredibly full of history and the most cultural place I have seen with contiki.