I am wondering if I will see any benefit fom upgrading thermostats.

We have a 2600 Sq Ft home build on a radiant heated slab. There are four zones. The floors are tiled with Ditra between the slab and tiles. The head source is a oil fired boiler. We are located in upstate NY. We are pleased with the current performance except for heat overrun that occurs when we get a lot of of passive solar heat on bright days, we have a lot of south facing windows.

My current thermostats are your basic Honeywell T87K. I have been told that programmable thermostats are not a good idea with a radiant slab, however I see that there are several thermostats that claim to be designed for radiant heat. Some measure the slab temperature and the air temperature. To mesure slab temp I assume that I would need to remove some grout and imbed the sensor.

My question is will I see any lower fuel consumption or improved comfort by going to four of these "radaint designed" thermostats? Is there any brand/model that you would recommend.