Some comments about the Hennessy Racer models.
These were made for the adventure racing crowds who use gear very briefly and throw it away/leave it behind. I wanted to try one, but Tom refused to sell one to me for years. He said I would not be happy with it and that it would wear out too fast. The Racer models had only a one-year guarantee, while other models were touted as giving years of service. If the model is being discontinued, it is not because it did not perform as anticipated.
To save weight and bulk, the Racers are made with all frills cut out: Velcro spots on the entry; fly attached to hammock with knots instead of hardware at the long ends as well as the sides, lighter and less durable materials; body less deep and shorter. I'm estimating the body is a good foot shorter.
I can use an air mattress in a standard Hennessy, but there just is not enough room for me to do so with a Light Racer. (Experiments with insulation, not needed for comfort.) Tom said I wouldn't be comfortable in a Light Racer. I admit that I'm not AS comfortable, but even a small Hennessy is more comfortable than the ground. I carried and used an Adventure Racer for the 134 miles from Springer to the NOC. I was happy for the lighter weight, extra-breathable thin bottom, and was able to use a MLD poncho instead of the fly, so shaved a few more ounces.
I understand the that bottom is likely to wear out quickly and am willing to replace the hammock if it means I carry less weight on a long trip.