I got the 2014 Star Wars AT-AP (out of production now).
It is great!
Very nice looking when finished, a lot of details, nice size. The leg's especially looks great, very detailed. Makes a great display piece.
Has some interesting building techniques, especially the side panels of the body. Never would have though about making a "hook" to hold them closed. Impressive.
It is kinda hollow and has some holes, though mostly so that they aren't immediately apparent or visible. But this is all right, i noticed there's a lot of stuff i could modify, to make this even better.
There are a couple of things i could do to make this more accurate but that might require making the body slightly longer.
The only real downside in the set is the minifig selection, with only one Clone Trooper instead of 3 of them (since the walker seats 3). Never been really interested in minifigs, and even less so about Wookiees. The standard Battle Droids are OK, if i'd look for my existing ones i'd have a nice extra large platoon of them. The Super Battle Droid is meh, the way the torso is molded with hollow back is disappointing.
Also, there were some piece choices that felt like they were for inflating the piece count rather than having actual purpose. The center piece everything's built upon is perhaps too complex and the same durability/stability could be achieved with some simplification.
Shame the AT-AP is close to unknown, visible only very shortly in Revenge of the Sith, with no real close-ups. An interesting and good looking walker. Kinda impressive how good model Lego has produced from so little.