The biggest problem with these is that they all have an expiration date - and Microsoft frequently forgets to update them. And getting through to Microsoft to tell them it is out of date... forget about it.
Instead, we just narrowed our IE support to what we could maintain easily with a legitimate copy of windows installed on a VM.
I've recently been in several large corporations and they won't support anything below IE8 now. Most are dropping support for IE8 after IE10 becomes more widely available.