Should work about as well as advertised. There have been many that have tried and used them. Capacity is about right, and low self discharge performance is OK.
However, in my opinion the regular "1500" cycle Eneloops are a better deal in the long run, with 2.4x the cumulative lifetime capacity potential. Also, if you consider that at least here in the US the XX cells cost about twice as much as the regular ones, for the same cost in cells, you get 4.8x the cumulative lifetime capacity potential and 1.6x capacity per charge switching out the depleted cells for full ones with the regular Eneloops.
The only real advantage of the XX cells is that they have 1.25x the run time per charge without having to switch out the cells. If that is something that is more important to you, then they might be worth it to you.