I bought my 42 fairly early in the cycle. Like you I just recently got the G43, and paid about the same as for the G42 ($500). I didn't even know the G43 existed until I saw it one day in a Glock magazine that came in the mail. I rushed right out and bought it - unlike you I didn't think on the way out to take my Taurus TCP for trade in (about the only gun of mine I'd care to part with). The G43 is great - low recoil and 100% reliable so far....
A question for you 42 owners:
When I was at the shop that I bought it from, I saw that he had the 42 for 100 bucks less...I was assuming that glock was probably cutting the dealers good deals on them trying to clean house for the 43 sales/inventory.
What did you guys pay for the 42 when it came out, was it full price, or was $399 the going rate on that gun when it came out?