I've been using my CF 710 for over a week now and I thought I'd share my experience so far.
What I hated about all the oil pens I've had in the past is the fact that you constantly have to reload them and the hits are usually not even close to as good as a dab rig. The CF 710 has done all the great things of a oil pen (portability, good battery life, easy to use) and made it so that you don't have to constantly reload. It comes with a small glass jar which you put your concentrates in. You can load a pretty good amount of shatter in the jar, so once you load you're set for a while. The unit fits in my pocket easily and the glass jar that comes with it is very small. This makes it excellent for on the go vaping.
Overall the CF 710 feels really well made. It is made of mostly stainless steel with some kind of other material on the exterior of the device. The 710 comes almost completely apart which makes it great for cleaning. The airpath and vapor path appear to only run through stainless steel. When you take apart the unit you can see the entire vapor path.
The coils also appear well made. They are made of stainless steel and cermaic or quartz depending on coil. I cannot see inside the coil so I don't know what's inside but I'd assume just stainless steel. A few burnoffs when I got the coils produced no off gassing aside from a small amount the first time I fired them up. I've experimented with both coils and prefer the quartz over the ceramic. The quartz has great flavor with good hit size while the ceramic has worse flavor but a bit bigger hit. I've run about a gram through the quartz coil now. I've cleaned the coils twice now and it's super easy. I just burnoff the coils using the 15 second burnoff feature on the CF 710. They come out pretty clean after the burnoff and then I just soak them in ISO for a half hour and they come out sparkling clean. Cleaning the actual unit is also very easy. Since it all comes apart you can clean all the parts with qtips dipped in ISO.
Here are a couple photos of the quartz coil after running a gram of shatter through it and cleaning it:
http://imgur.com/FpqoMKP
http://imgur.com/2VsUtCu
The CF 710 gives massive hits compared to most dab pens. It also uses more shatter than a typical dab pen because it's so easy to overdab when all your concetrate is sitting in the jar. I've found a thin layer of shatter in the bottom of the jar works best. If you layer the shatter too thick it can migrate up into the coil. That's where much of the waste comes from. If you layer the shatter in a thin layer you can conserve very easily.
The battery life is pretty good as well. It is only 900 mah but unless your dabbing a crazy amount everyday there's no way you'll run out the battery.
Overall I'd give it a 9 out of 10. I've yet to find an oil pen that I liked and while this isn't technically an oil pen it still functions in a similar manner. For on the go oil usage I'd say this is an excellent option. The price is also very good.