I do a lot of SMD, this was laid out as a kit so I did it with thru-hole stuff as many people have difficulty with SMD. For this application, there was no benefit to SMD, there's plenty of room for the board inside the DCS-RC where it installs.
I do have a size limit on hand assembled SMD, usually 0603 for resistors and caps. They're still pretty easy to handle. I once screwed up and specified some 0201 resistors on a board, I couldn't even see the little things! It took me forever to build the prototype, and I immediately sent that sucker out for a rework with larger parts!
Most of my products that are sold through Hennings are SMD. Also, most of the stuff I've build for local use here is SMD, only a handful of the projects end up being thru-hole. If it might be offered as a kit, I look at thru-hole. Also, if I'm going to hand assemble a bunch of them, I may consider thru-hole for at least some parts, it's usually quicker to do.
