I recently did the Sundarbans tour with Rocket. The boat trip around the Sundarbans was fantastic. The Rocket was unfortunately out of service at the time but the substitute boat was still very good.
The people in Bangladesh are all friendly and I never felt threatened at any time. I would say that the country is very safe for visitors these days. The guide and the boat people were all great and very helpful.
I would recommend this tour to anyone looking for an exciting and interesting trip.