My opinions, yours may varry:
The final thickness on the material is very thin, so acrylics need to be well painted on the inside, and any thing with any depth is out of the question. Wood needs to be glued in very well, as any spots that aren't secured may come off the tube.
They are basically the same as the ElGrande kits, and I know when I started making those, the drill bit they specified for the cap was just a hair too small, and I had a very difficult time getting those tubes in, so if you're looking at getting into these kits, check around before you buy the drill bits and be sure you get the right size...
In the end, I just wasn't a big fan of either the ElGrande or Cambridge in general...