I take a different view of TPMS than many here. I don't like much technology on my bikes; don't care much for ABS although I don't disable it, don't use GPS on the road at all, etc. But the TPMS that was factory installed on my Triumph has saved our behinds twice, and I'm installing it on my other touring bikes.
Here's the thing that I'm not sure that people understand. TPMS IS NOT A SUBSTITUTE FOR CHECKING YOUR TIRES WITH A GAUGE! It is not a substitute for proper maintenance.
It is to let you know that something has happened to your tire WHILE YOU ARE ON THE ROAD. You cannot find that with the most assiduous maintenance schedule and most accurate gauge.
On the last leg of an 8000 mile, month-long ride, Fay and I were riding down US 58 ALT from Pennington Gap towards Abingdon, VA, with a month's worth of gear aboard, probably grossing 1100 or 1200 pounds. Curvy two-lane, looooong downhill, no traffic, leaning way over on each turn. Guardrails but no shoulders. I had checked the tires at the motel that morning like I do every morning, 36 psi front, 42 rear per the book.
Suddenly the red tire light comes on. Not 42 psi any more, but 40. A few seconds later, 39 psi. Then 38. Then 37. No place to pull off the road. I slowed way down and started looking for a place to pull off, knowing that if it went below 20 psi I was going to have to stop in the traffic lane.
At 22 PSI, there was a gap in the guardrail, and the parking lot of a little mountain elementary school. We pulled in and parked, safe and sound.
If I had NOT had a TPMS, the first I would have known about it was either getting a big wobble when laying it over in a turn, or the tire coming off the rim under that max gross load. I'm a BIG believer in them now, and have installed a set on my 2009 Stelvio, and any other bike we ride two-up.
The story of what happened next on that day is a testimony to how you sometimes have awesome good luck to make up for those "Aw SH!T" times, but that's another tale ....
Lannis