Our third trip with Regent ( we've been with Seabourn and Silversea) and our second on Navigator, having done the San Francisco to New York leg last year, we opted for the NY to Montreal section. This was an unusual cruise for us as we were going from sun to decidedly cool weather.
The other 6 star lines are very good in their different ways, but we do feel Regent staff seem to have that spontaneous friendliness which pervades - and yes we do know that they work all hours for months at a time. The Compass Rose really is excellent and one feels comfortable as a two or sharing a table.
We personally would prefer the verandh/setti Mari to be service only in the evening with a change of appetisers as well. Some items in tureens for self service tend to dry a bit. Prime 7 is an excellent fine dining experience and performs well. Thankfully they seem to have reduced vegetables a bit so one is not so overwhelmed and the waste on plates (which we as elderly UK residents who had to eat up everything after the war hate to see) may be less.
An excellent suite with superb housekeeping and a knowledgeable butler.