i have the Csixx 150gm, had it for some months now. i love it every bit more than the past guides i have used in the past list as follow.
truvativ - box guide
E13 - ls1 and lg1
mrp - g2
straightline - silentguide
and that includes multiple lg1 and g2 due do excessive damage and was unable to use. (this is not a bad thing towards the e13 and mrp guides, the served their purpose) keep my chainring and cranks safe and free of damage.
how ever i did notice how they compare to multiple impacts as compared to the Csixx 150gm guide. both my guide and Josh Mitchell's have taken some serious stop you dead impacts (quite a number of in my case) and have held up with out question. are straight!, free of structural cracks and fractures, especially in the areas i suspected they would. ie the ISCG 05 etc bolt holes. (i was certain this would be the point that would give out before any other, how ever i was wrong. what did happen, was rather than crack/ snap/ or fracture, the impacted areas frayed. (think of it in the situation when you hit soft wood, like builders pine with a steel rod) rather than being so rigid in construction that it just fails, it dints, dints and dints more and only the area impacted over and over will start to open and show signs of ware.
as compared to an alloy or steel construction version, if it took the same impacts they tend to bend out of shape and either hard press the chainring, clean snap, or simply bend so far out of shape they stop the operation of the unit/ your entire drive train in that one incident.
There is a Yellow section on the backing plate/bash ring, that covers where majority of heavy nasty impacts accrue, this is not just a yellow carbon, it is infact a carbon/KEVLAR weave as apposed to a carbon/carbon weave. this increases the strength of the impact area, over longer periods of time.
to adress the couple other concerns out laid by the above posters, bearings (jocky wheels)....given that all our systems use them, in rear mechs, is this such a problem? the other option is the silent guide (which is far from silent) creates a similar drag, as there is a need for the lower slider to have tension on the chain just the same as a jocky wheel would.
and onto the chain lube on carbon conundrum, use what ever lube you currently use, because its not going to cause any issues. firstly the Csixx guides all use a nice thick clear layer, for both protection/longevity and ease of cleaning. i currently have changed out my Sram X0 jocky wheels for my own brand Carbon jocky wheels, with great success. the plan was the same for the Csixx when/if the wheel needed replacing for what ever reason. (including as simple as the anodising waring off the teeth) this happens with any product.
i recommend the guides over pretty much every other guide out. and put simply they are sexy as hell. and tonnes of colours
i will get some photos asap.