Congrats. You'll love it. I've had mine for several years and use the heck out of it. I no longer cook "just a little longer" to be sure the food is safe to eat. That alone made a huge improvement in my cooks, as well as, gave me piece of mind that I would not make anyone ill.
If I have a large piece of meat, like a loin or turkey breast, I use a Chef Alarm to get me close. I say "close" because an accurate reading all depends on if I centered it good enough. When it reaches temp, I use the Thermapen to ensure that I've reached my target temp everywhere. I cooked a turkey breast the other day. I thought I had centered the Chef Alarm pretty well. It read 165. So, I thought I was pretty much done. I went behind it with the Thermapen, as normal, and I was surprised to see I was getting readings in the lower 150's. I know my Chef Alarm is accurate because if I relocate it, I will match my Thermapen. It's just amazing how much variance there can be a few millimeters away.
@Tommy, if yours isn't backlit and they will let you swap it out, swap it out. I wish mine was backlit.