I like how the newer units have built in WiFi along with the RJ-45 connector. We had a network switch go flaky and the WiFi units kept going along without interruption while the older wired units were losing their network connections.
Small but powerful units; I've been buying this style Lenovo for over a year to replace old XP boxes in our plant; The newer ones don't come with as much annoying add on software that needed to be removed before I put them on people's desks.
Newer models don't come with the VESA mounting bracket in the box; Must buy separately; My older units mount behind the monitors so they are completely hidden from the operator; Last Con: the price went up from last year