I'm extremely dissatisfied with my CADLights 25gallon too! Shipping took forever and they did not bother to e-mail me to let me know they were backordered. They shipped me a different design than was posted on their website... a much worse design that they have since changed again! They got rid of the overflow teeth for a bulkhead/strainer combination which limited flow alot. I have been modding the combination with a JBJ surface skimmer and had to replace the plumbing in the back to try to help improve the flow. The 150w HQI light hood comes without fans, so the fixture gets extremely hot to the touch! I ended up modding the fixture to put two 80mm fans on top, one blowing in and the other out... simple mod, but fixed that problem. The refugium area needs work also, but i'm afraid i'll break the glass if I try to remove the baffles that are siliconed in. I e-mailed CADLights about all of this and they didn't seem to think any of this was an issue. If they took a look at the other major manufacturers designs and mimicked them, they would have a better product.... I'm sure the 35gallon will have the same issues, though I haven't seen it in person yet.
However, the tank itself is constructed really well with extra thick glass... seems very durable and rugged, IMO. If I had to do it over again though, I would go with a different tank that's been proven to work.
Eric