So, for me, no. Not at this time.
But if I gradually upgraded to components/wheels that were 10 and 11 compatible, I would eventually like to have that extra gear.
For example, I am already running 11 speed cranks with 10 speeds, and one 11 speed rear derailleur, and they work fine. I suppose the front derailleurs must also be 11 speed compatible (as with most other components but the shifters) .
Also, I don't really see the lack of one gear as limiting me. It is my fat ass and lack of power.
Cycle Dynamics no longer makes cassettes. I got the parts to make a similar 10s cassette from an 11-25 DA and 27,30 cogs on a spider from IRD but have not tried this frankencassette yet. If it works I wonder if I can use the 27,30 10sp spider with parts from an 11sp 11-25- only one gear jump would be at the wider 10sp spacing.
Yes I know I should cross-post to gearingweenies.
SRAM not so much. I run Campy so I've ben 11s for quite some time.
Wheels are the only drawback to going 11s. Hub companies are charging way too much for 11s upgrades.
Lucky for me, Campy compatible hubs have adequate spacing for 11s. I run Tune hubs, and they've been 11s spaced dating back a couple of hub models.
Slowtwitch recently had an article on 11-speed. The crux of it is that the added cog added more versatility to your cassettes.http://www.slowtwitch.com/Tech/Cassette_Evolution_4171.html I can tell you that this is true. Personally, I used to run a 12-25 cassette for flat riding, and an 11-28 for hillier rides. The 12-25 gave me a narrow range of gears with minimal spacing, so no big cadence drop-offs, whereas the 11-28 had huge gaps, but I used it solely for climbing. When I went from 10-speed to 11-speed, particularly when using the 11-28 cassette I have for climbing, the gaps are much smaller, the cassette acts like an 11-25 cassette, with a 28T gear added to the end. I get to have my cake (relatively narrow gearing in the lower part of the cassette) and eat it, too (a 28T for serious hills). The only drawback in my case is the weight penalty.
As for the wheels, many are upgradeable for a small cost. Reynolds sells new freehubs for less than $100; same goes for DT Swiss (I changed over the DT240 freehub on my TT bike's wheels to the 11-speed version, in case I have to use those wheels on my road bike). Of course, if you want to start the upgrade process on wheels that can't be upgraded to 11-speed Shimano/SRAM, you can always use a Campag freehub/cassette combo, which has been discussed on other threads. You can also run the 11-speed cassette minus one of the gears, as has also been discussed.