Me and my dad picked up a pair of Garmin rino 530 on eBay. They're expensive-would have been $1000 for the pair but got them new on eBay for $400 for the pair. They're a little bulky but with the built in gps and you can pick up everyone else location who has one is great for drives. As for the mileage... The hill we cover is 1400 acres and can usually cover end to end as long as it's a clear day. personally I think teyre great and well worth the money.