5 of us climbed Strahlhorn from Britanniahutte by the normal route on July 23rd. We planned to continue on across Adlerpass to Flue Alp on the Zermatt side. The descent from Adlerpass to Flue Alp was an absolute nightmare - 1 hour on an untracked glacier, then 2-3 hours of picking our way along boulders/scree slopes beside the glacier, and finally a difficult scramble up out of the glacier basin to the Flue Alp hut. There is nothing technically difficult about the route, but at the end of a 5-6 hour climb to the top of the Strahlhorn, it is exhausting, and in wet weather would be treachourous. Arrived Flue Alp at 1830hrs - superb hut, well worth the effort!
The article states that only spring and summer ascents are done, while some climb it in winter as well, mostly guided though and on skis. (See here)