Story time. I'll try to be brief.
2015: After 27 years riding DF bikes at a spunky pace, my lower back just couldn't do it any more. It totally seized up at the top of a long climb; and I love climbing. I could: quit riding, ride sitting bolt-upright at about 12mph, consider alternatives to the DF bike, or take up...running?
Started researching recumbents ("bikes for silly people," my brother called them). Every brand claimed their design was "the best," and forums were a mess of conflicting views, many of which started with, "Well, I've never ridden a [insert brand and model here], but I have an (uninformed) opinion anyway..."
Came across Cruzbike. Liked the idea of not having a 12 foot chain and idlers. Liked that it used regular parts as they were meant to be used. Liked the idea that the design involved the upper body, similar to standing and pedaling on a DF.
Out of equal parts desperation and blind faith, I plunked down the cash for a V20 frameset and a Dura Ace 9000 drivetrain. Never ridden a recumbent before, and I had apparently chosen one of the more challenging ones to learn on. Spent the next 500 miles wondering if I'd made an expensive mistake (never mind the first 100 miles that verged on terror).
I will spare you the details of my learning curve. Just know that there is one, and it varies in difficultly from rider to rider. I got through mine mostly through sheer stubbornness.
Fast forward seven years to today: The V20, now V20c, has been, by far, the best, fastest, most entertaining road bike I've ever ridden. No pain and much higher efficiency, which means more miles. The speed is addictive. Views on the V20 as a climber do vary, but for me, the thing climbs all day like a goat, at just about my old DF speeds. I have four bikes--two road, two off-road--and I enjoy them all. But if for some terrible reason I had to narrow that fleet down to one, the V20 would be the one to stay. Also, if I woke up one morning and my back said, "because you've been such a good boy, the back fairies have decided to give you the spine of a 20-year-old," I would not go back to a DF bike.
My one complaint: Riding with others on DF bikes can be a drag because they're so slow. I end up doing a lot of coasting. A couple weeks ago, a friend and I were covering a long, gradual descent. He's pedaling with a sincere effort while I'm coasting, and I'm still pulling away off the front (even though I only weigh 130 while he weighs 180). For the two of us to stay together on that descent, he had to pedal, while I not only coasted, but used the brakes. That's how slippery these bikes are.
The end of my story is that I am glad my lower back forced me to find the V20. A bit of serendipity, for which I am thankful.
This forum is absolutely the right place to ask your questions and find advice. It's a great community that I'm glad to be a part of.
Sorry to hear about your back troubles. I hope you find your way through it.