IMO the last thing you need is another distraction on the dash, i.e. a TPMS monitor to keep an eye on. The TST will warn you with a very loud alarm if a tire loses air pressure or the internal temp gets too high. A TPMS may not warn you if you have a blowout, it would depend on what causes the blowout. By the time the TPMS senses a loss in air pressure due to a blowout, it would be too late. But if the blowout occurred due to low air pressure and a resultant build-up in heat leading to a blowout, then the TPMS will do it's job and notify you of an impending issue.
Look at them as additional insurance.