It’s reached the part of my Lego collecting lifetime where I’m starting to upgrade sets that I bought years ago—in some cases at the dawn of my adult Lego life. As I noted a year or so ago, I’m a grown up who still likes Lego, a so-called AFOL, and have now been so for close to 15 years. In that time Lego has dramatically improved their range and building techniques have evolved. So I’ve started replacing sets that I built when they first came out with the latest and greatest.
So far there have been three: the Burj Khalifa (21031 replacing 21008), the Guggenheim Museum (21035 replacing 21004), and the Y-Wing (75172 replacing one of the models in 7152). I’ve previously published a review of 21031 incorporating a comparison with the older model on Brickset, and just published (and am awaiting moderation on) a comparison of the Y-Wings. There may be more coming in the future…