Beam bikes
I have ridden a Softride Solo for 6 seasons now, have about 2,000 miles on this frameset. (first Solo frameset broke at a weld, and was replaced at no charge by Softride under 5 year warranty program. It had 10,000 miles on it.) I bought the bike because I do have some back problems in the form of 3 ruptured disks. I do not race or time trial the bike, I do 35 to 50 mile rides twice a week, more often if schedule allows. I love the bike.
The beam will help you develop your spin. If your cadence is less than about 75-80 rpm, the beam will "bounce" a bit. If you spin at higher cadences, there really is no "bounce" in my experience. Although I'm a fairly large guy for a cyclist, and most people would assume I'm a masher, I spin at about 95-100 rpm with no bounce, and that's good for my knees, etc..
On longer rides, the guys I ride with are getting out of the saddle for small bumps, etc. I just pedal on through the rough stuff. If I needed another bike, I would purchase another Softride. If the guys I ride with were in the market, they would all strongly consider the Softrides.
Of course, YMMV. My .02 cents.