Yesterday, Apple sent me an email in response to the iPad 3G 16GB reservation I made 17 days ago.

I was excited despite already owning an iPad Wi-Fi 16GB. I rushed to Apple Store (Oakridge), charged $695 to the credit card, and went home in joy, hoping to turn this into my primary device.

I compared the two iPads and found them to be identical except the sound coming out from the speaker. I tested both devices using the same music, tuning the volume control and discovered that iPad Wi-Fi sound quality is actually better, louder and clearer than iPad 3G. To some, this is slightly unnoticeable, but I’m able to sense the difference.

On an iPad 3G, it was also a hassle to switch between 3G and Wi-Fi. At one point, I noticed that after switching back and forth, the 3G was either low or has no signal.

These two weaknesses are sufficient to make me return the iPad 3G today. There’s 10% restocking fee; a small price to pay for being itchy with iPads.