Garmin GPS 12 Handheld GPS Receiver

I recently decided to purchase a GPS for our family camper. I purchased and returned 2 GPS units, the Rand Mcnally Palm V GPS and the Laptop GPS. The Palm V gps worked functionally, but would not turn off. It also was very sensitive to tree cover and positioning in the car. At times I could not get a fix. It would not work at all in the camper. Then I bought Laptop gps with the Streetfinder software. The positon and heading would drift all over the place, and the signal strength indicators would drift up and down no matter where the gps was placed. I have to say that the Street finder display was great on the laptop. My bet is that they do not have a good Quality assurance program due to the low pricing