Tire Pressure Monitors, worth it?

Inthecountry wrote:
http://www.amazon.com/gp/product/B00EHHV2OU/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944687742&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00C546H6U&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1WENYMV0VBX1Y9B36WSH

I take it that this is the one?

I should also say this is for a living quarters horse trailer and that I don't go further than 2- 2 1/2 hours away at any time and I only travel on regular hwy's or back roads to get where I want to go. And to be honest, my most traveled place is under an hour from me. I have four tires on the trailer.

I'm not sure it's needed as much as those of you who are traveling across America?

I know that blow outs can happen anywhere.

The unit suggested was about $100 more than I thought it would be so have to take a deep breath and think is my kind of traveling worth it?

We travel mostly close-to-home so far, too. On one trip, tires checked fine before departing the campground for home; a pit-stop walk-around two miles from the storage yard revealed a flat. That sealed it for buying a monitor. First trip with the monitor, tires checked fine on leaving home, walk-around on leaving campsite all appeared fine, but the monitor alerted at the dump-station - low-tire. Swapped for spare while waiting in dump line; tire shop later found embedded screw. Tire monitor likely saved a road-side failure.

I'm sold, as I can't feel a low tire on the trailer when going down the road...