I am lucky enough to be able to borrow a Lactina from work, and have been using that since I started pumping. Pumping is not at all comfortable, but I tolerate it. I start on the fastest speed and lowest suction, and increase the suction if I can tolerate it after a couple of minutes.
The other day I had access to a Medela Symphony for the whole day. It was great. Quieter, and I like the way it starts with low suction, fast speed and then switches after 2 minutes to higher suction, slower speed. It helped me imagine I was nursing a baby. I got similar amounts of milk with both the Lactina and the Symphony, but I liked the Symphony better because of the settings (it seemed to have a much lower suction setting that was much more comfortable to me)
Jenny