I was debating between The Full Montagu and The Earl's Club. My dining companion decided to get The Earl's Club and I'd get The Full Montagu and we could try the other person's sandwich. I thought The Full Montagu was just okay. It could be because I'm not much of a roast beef person (why I got it, I don't know lol) and it was too much meat. It was definitely very filling. I had a bite or two of The Earl's Club and liked it better than my sandwich.
Bottom line: These aren't the best sandwiches I've ever had, but what I tasted of The Earl's Club was good enough to make me want to come back and order that next time. I probably would have gotten it on this visit had I known that the turkey and bacon combination works for this sandwich. (I like turkey sandwiches and bacon in general but have never had the two together.)
Also, don't be put off by the long line or how full the restaurant may look. The line goes pretty fast, the food comes out quickly, and there's a good turnover of tables.