I cant comment on the ZDZ or DA question, but I do have a 27% CA Extra. You wont be disappointed with this model. The kit is very simple to build. The instructions arent the greatest, but this model is laid out well enough to not even need instructions. I fly mostly IMAC with my model and so far i've been very pleased with the results. I've read that they 3d pretty well also. It will fly very slowly and the large ailerons really make it controllable all the way up to and past the stall. I'm not related to or involved with the CA company, just a happy customer. If you have any specific questions regarding setup or construction feel free to ask.