No travel adjust in the sense of, say, going from 170mm to 150mm with the flip of a lever. I don't think any of the 66 models have this, although it sounds like maybe you could get a bit of travel adjust functionality by adjusting the negative air on the 66 SL.
The 66 LIGHT has the ETA, which reduces travel from 170mm to about 30mm and holds the fork down in a compressed state. This mode is really just for climbing, fireroading, etc. It's not really a travel adjust. Once the trail turns downhill, you turn off the ETA, the fork expands back to full height, and you have your 170mm again. The ETA is really the main reason to buy this model in the 66 line. If you're not going to do much climbing, you should look at one of the other 66 models.
My 66 is very plush, but I noticed rebound gets a bit slower in colder temps. The fork is also very stiff. It's definitely been a great addition to my B