Product review (5 stars): Calibration is a *huge* improvement over standard units.
The best (so far!). After 3 LaCrosse units, where the indoor and outdoor units differed by 2F or more when sitting beside each other (and the outdoor sensor lasted only 2-3 years)...this unit allows temp and pressure calibration.  Some hints for that:

1) Temp must be referenced to a good thermometer. I used a Thermapen cooking thermometer (highly recommended for cooking as well!), dead accurate in both a stirred pitcher of iced water (32F exactly ) and a rolling boil (212F, if at normal barometric pressure). Whatever thermometer you use, you must be able to dunk it in water to reference it to those two absolute temps. Then leave the main unit and sensor and your thermometer beside each other for => 1 hour and calibrate the inside and outside temps using the Set system. (Instructions are actually quite comprehensible: good!)

2) Unless you have a super-accurate barometer, pressure calibration is best done from your local weather source, at www.weather.gov, using the latest number.  But don't use the weather source for temps: local temps vary widely locally; barometric pressure doesn't.

I love the brain that follows the pressure change with time, linked to the "forecast". Not too meaningful, but probably accurate 90% of the time, and really cute!

I've only had it 3 days: we'll see how it goes!

PS (After 2 weeks). Still 5 stars, spot on with local weather.gov for barometer and (when temp is the same) pretty close for humidity too. And still compares fine with Thermapen. The sensor/sender doesn't look adequately weather-resistant to me, so I glued up a little plywood house for it, about 4W x 3D x 8H, painted white inside and out, open at the bottom, with several 1/2" holes top and bottom in the back for ventilation, and sloping roof.  (Attach the front with 2 screws so you can get to the sensor.) It's on the north side of a garden shed, away from the house, never sees the sun, screwed to a 1" block so it stands off a bit from the shed wall. Range is good: it's about 40 ft from the receiver indoors, works fine.

If it fails before 12 months I'll be back for a stars change. Otherwise, cross fingers!