Is this sentence correct?

[TheParser]

Teacher Fivejedjon:

May I have your comments about post no. 9 in this thread? Thank you/

[5jj]

May I have your comments about post no. 9 in this thread? Thank you/

Could the "is" be justified by saying that it is matter of ellipsis:

Quite likely, [the matter of] where I grew up and how I grew up is very different from your background.

. I have no problem with the full version: Quite likely, the matter/subject of where I grew up and how I grew up is very different from your background. Even here, however, the pedantic side of me would prefer something like: Quite likely, the matter/subject of where I grew up and how I grew up is very different from that of your background. The ellipted version does not work for me, though I suspect that it would not jar at all if I heard it in conversation.

There are times when I think that perhaps I have been a teacher for too long - I sometimes wince at things that are perfectly acceptable for most speakers.

[TheParser]

Thank you, Teacher Fivejedjon, for reminding me that I should have written "that of."

[5jj]

Thank you, Teacher Fivejedjon, for reminding me that I should have written "that of."

I didn't say 'you should have' written 'that of'; I said, emphasis added, 'the pedantic side of me would prefer something like ...that of ....'. I am not just playing with words there. Though I, personally, would probably write neither

Quite likely, the matter of where I grew up and how I grew up is very different from your background......or
Quite likely, where I grew up and how I grew up is very different from your background,

I see no objection to the first in everyday speech, and am not unhappy with the second, or with Quite likely, where and how I grew up is very different from your background.