I'm more looking for expensive
Oh, not often we read of people actually seeking to spend more than they need to ;-)
The problem with GPS units needing pen cell batteries is size. The units start getting large and you end up not actually using them because they take up too much space and weigh too much.
Garmin seem to be the gold standard in this market.
The advantage of the 747 is that it uses a standard cellphone Li-Ion battery that lasts a very long time, at least a day, and is small enough to fit into a pocket. Recharging from a standard USB lead is also a plus. I've had no issues with reliability either, the MTK chip works remarkably well even in marginal reception conditions, it's also fast to 'hot lock' when signals are lost and regained. It's also discrete and unlikely to be a theft target.
Smartphones also work well and are very convenient, but turning on GPS seems to hit battery life far too hard in use away from a charger(ie they'll work OK plugged into a car charger if you never get far from the car when shooting).