I'll assume you're referring to Copilot...
Had a few FC's while setting up in the menu, turned off the annoying "welcome to copilot live professional" super loud voice greeting, and interactive feedback sounds... and haven't had a FC since. It does use the full HC screen real estate- you choose via the menu for portrait or landscape mode- or let the tablet decide. One nice feature is- tap the POI's and it gives you basic info and the phone number to the POI. I DL's the maps for Eastern US to save some room on the SD card, but could of had all the US for $5.
If you want to try a nice free mapping (no nav feature AFAIK) app try- "MapDroyd"- not as nice as Copilot- but it's free and works well!
I was willing to pay the $5 to test out Copilot with maps....but a lot of the reviews claim that the software is hard to install and use -- apparently due to copy protection schemes. What is your experience? Also, it sounds as if you were able to download only some of the maps for free...is that correct?