Just to add to Mightygem, you still have 135s out there who haven't had the latest software upgrade which modifies the HDG hold behaviour because it costs money.
Something like this should be done free under the guise of improving Flight Safety.
We all talk about Flight Safety but when there is money involved it is all over a sudden not as important anymore. Especially considering a Software upgrade isn't really that expensive....
Sorry for the hijack.