When the front TPMS on my 09 went out it was just showed dots--- No warning sign, the battery in those units have a 5 year guarantee. since it will be replaced under warranty and they have to remove the tire to do it you should get free labor on your front tire install. My front only lasted 3500 miles, I replace the rear at 5500 miles, it could have gone a couple thousand more but I was going on a trip and didn't want to chance it. I replaced mine with the Bridgestone 023, great handling and looks like I should get at least 10,000 miles from the front, the rear still looks new.
You're the first person I've heard that went with a replacement Bridgestone. I was thinking about getting the 023 when the time comes, but with all the bad talk about the OEM 021, I am a little leary.