I, regretfully, got 2 sets of grandcells for my 295, 'cos like the man said, they eat AA's. Within 4 chargings ALL had started to leak contaminating the battery compartment of the GPS and requiring considerable time and effort to clean and neutralise the corrosive action.
I still use rechargables, but now they are the new Energiser NiMH, exxie I know BUT still going well despite the abuse and they seem to have a better discharge characteristic than straight alkaline cells.
All that aside, everyone who has used the 295 loves it, even if you have to update the database sometimes, once a year's enough unless your really serious.