My original, and three subsequent replacements done by the dealer, have all been Behr. I would agree with the "soft failure" comment as the last two replacements were based off of stored codes and not a visible temperature gauge indication.

2002 X5 3.0 312,300 miles
2014 428i 22,800 miles

2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles

1970 Firebird - Under restoration