MobileTechReview has published a review of the Asus MyPal A636, Asus Windows mobile pc with GPS capabilities and they report:
Convergence devices generally make concessions. For GPS enabled PDAs this means the PDA portion may be lacking in horsepower, a recent OS revision or wireless connections. The ASUS A636 is one of the first GPS Pocket PCs we’ve seen that rocks in both departments. The PDA portion’s features, power, performance and connectivity are top notch and the GPS hardware is excellent as are the maps. For the price, you’re getting an excellent machine, that lacks only in the looks department.