Having worked as researcher/dev in both private office and open space setup, I am absolutely convinced that private offices are way more productive than open office setup for researchers and developers. Most, if not all, of my colleagues feel the same. In fact, I don't think I will ever accept an offer from a mature company (not startup) which houses its developers in open space.
Development is always tricky because often you need clear air to solve problems but then occasionally collaboration is required.