You won't be sorry. I use mine nearly every time I grill or BBQ. It will change the way you cook. No more over-cooked steaks as you said.
Now some on here will tell you that you should be able to look at a steak on the grill from 100 yards away and tell if it is done just by looking at it. I'm not that good YET so I rely on my ultra-fast Packer green Thermapen for good results every time.
LBGE, 22.5 WSM, Backwoods Chubby, 26.75 OTG, Weber Performer, Ultra fast Packer green Thermapen, American flag Thermapen