The T/H shield of the new generation sensor arrays (WH65 and WS80) are reasonably good, especially the one which comes with the WS80.
They can all be received by the GW1000.
I have a WS80 (ultrasonic anemometer + solar radiation + T/H outdoor array) next to the "king of passive radiation shields", the Barani MeteoShield Pro with a WH31-EP (extra T/H sensor, extra precision) and the differences in measurements are 0.2-0.5 degrees (average); in absolute/maximum terms can the WS80 be 1-1.5°C higher than a (WH31-EP in a) Meteoshield Pro in times of strong sun radiation and low winds.
This is 49° N Latitude.
Constant sunshine (15.28 hours today) - no clouds. The theoretical maximum of sunshine today was 15.3 hours.
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The Davis 7714 is also pretty good (not as good as a Meteoshield, but also cheaper - between 70-110 EUR, Meteoshield Pro: 200 EUR).
But to see the relations: you can get the WS80 for 140 USD/120 EUR from Ecowitt (and that's not just a shield, it's a complete outdoor sensor array (only rain gauge missing)).
It also depends how big your personal tolerance for potential temperature measurement deviation in your local micro-climate is.