Darell,
Regarding data entry, you can pop up either the virtual keyboard, or the virtual grafitti 2 screen for data entry. When you're done, you can hide them to make the full screen available.
When you're in your car and want to go somewhere, it is pretty quick to enter the address info for where you want to go, and then route to it. If you don't know the address, but do know the location on the map, you can click on the map and route to that point. If you don't know either, but know the gps coordinates, you can enter them and route to it. If you're somewhere that you want to return to in the future, you can push and hold a button for 2 seconds to create a waypoint (address) for your current location, and in the future, route to it.
I've never used a GPS (nor PDA) in the past. The attributes that were most important for a GPS unit for me were the following:
1. Designed for automobile navigation.
I think the iQue does well in this respect. One of the best features is the ability to download detailed maps to an SD card. I have a 256MB card ($60), but 512MB cards work too, if you want the pay the higher price. You can load lots of detailed maps that way. The SP3 cards from Garmin are very expensive. The 2610 uses Compact Flash which is also very good.
2. Large Color Display with good resolution.
This was very important to me. The iQue screen area is about 14% bigger than the SP3 and 25% bigger than the 2610. I'm not sure what the SP3 and 2610 screen look like with the 305x160 pixel display, but I can say the 320x480 iQue display looks really good. I also like the portrait (vs landscape) display. On the moving map, your current location appears about 1/3 up from the bottom of the screen, so you see can a lot of map ahead of you. And I personally don't have a problem seeing the display in my car. It can be a little difficult if the sun is shining directly on the display, but that is rarely the case for me. Here's a photo of my setup in the car.
iQue Installation
3. Portability/Mobility.
I really like the ability to take the unit with me when I leave the car. The iQue quickly and easily snaps in and out of the cradle that I have mounted in my car. It fits in my shirt pocket or pant's front pocket comfortably. Here's an example. Later this month I plan to attend a large airshow where parking is in very large unmarked fields. It can be hard to find your car. I plan to create a waypoint at my cars parked location, and use my iQue to find it when the show is over. I also like the ability to snap the unit out of the cradle and hand in over to a passenger who could search the "points of interest" database (for service stations for example).
In summary, the iQue met my basic requirements very nicely. And, as I mentioned before, I have the PDA applications and MP3 Player as bonus items which I am starting to use more and more.
Phil