I've been a member of LCCA for about 3 years. I have limited funds available for discretionary purchases, so that figures into my responses.
1. I haven't been to a convention (would go if one happens to be in a somewhat local area).
2. Overall, it is fine. Somewhat easier to use than the old one, but don't visit very often as Al K. or Lou Caponi tend to post info on OGR.
3. Videos are well done. I enjoy watching them. I find it easier to get LCCA info here than go to the web site.
4. I haven't purchased any of the big ticket club offerings (and almost everything is a big ticket item) because of expense. I haven't purchased the convention car because they are Lionel standard size and I run Lionel traditional size.
5. Seems like a good plan, but so far nothing has been anywhere near my region of the country.
6. TLR is well-written and produced, but to be honest I don't find it very useful. It seems like 50% of the mag pertains to before convention or after convention articles (not much value if you don't go to the conventions), another 25% to info and advertising on the big ticket items for sale (again, not much value if you aren't going to buy them). Don't get much out of the tinplate cannonball column. I do like the Bill Schmeelk column, and there are occasional articles of interest.
I realize the convention and product info is valuable for quite a few people, so it probably has to be in TLR, but if you don't go to the conventions or buy big ticket items, then TLR is not an additional reason for belonging to LCCA, because so much of the content is about the conventions and big ticket product for sale.
I have used the Interchange Track to buy a few things, so I do find it useful. However, I think the change to the color cover is a waste of funds and doesn't provide value.
I'd like to see LCCA do some less expensive items, such as stand alone rolling stock. In particular, traditional size items. Offering a scale size convention car every year doesn't provide any value to those of us who run traditional size equipment.
I applaud the efforts LCCA is making to grow the hobby. The modular layout idea seems very promising. But, I'm thinking about not renewing my membership when it comes up as I'm not getting much from my membership.