my wife had the h20 expedition and it was a very good unit until it crappedout. thought long and hard on what to do, find used h20 on ebay/craigeslist, buy new lowrance model, or switch to another brand. ended up going with a new garmin oregon 550t. it was on sale for christmas. the biggest reason was that my wife really likes to geocashe, and the garmin units are set up for that. you can download information right from the computer to the gps. compatable units can also download information wirelessly. lakemaster maps can be downloaded right to the unit, no chips to install or lose. the unit will accept micro/sd cards to back-up waypoints and stored information, and all lakemaster/navionics maps. being this is the first garmin product in the family, there is a learning curve as to all the functions. so far i like the unit, time will tell. the lowrance only lasted about 4or 5 years, sounds like about the same as most. as far as the chip issue, i thought of that and because this unit is my wifes and she is using it for geocashing, not fishing, it was the right choice. if your chips will work in the new lowrance handheld units, then i would look into those. if they have changed to micro/sd cards, you will be buying new chips anyway.