Hey Ty, for the record E6000 I've been told by the Alpha group, is too flexible and the areas that have bondoed seems are prone to cracking.
Regarding the Devcon, it's pretty much the same as the over the counter plastic welders everyone else is using however, the Devcon in my experience though rigid has a bit of flexibility (pliable), similar to the ABS but not as flexible. Time will tell how it holds up.
The reason I went with the Devcon Welder II is because plastic welder type glues are what is recommended for the build and I wanted to use something that is known in the professional auto body world to be the best plastic adhesive designed take abuse, not to mention it's very easy to apply.
Hope this helps