Well - we ended up going with an '05 Sundance Altamar (loved the spa & loved the dealer), but the C45 was a close runner up. I floated a bit more than in the Sundance, and there were a couple of small things that worried us a bit about the C45, but would not have stopped us from buying it.
For those who may be considering this line:
1) I'm not sure that the pumps that are on the C45 are the standard ones used on the other Caldera models - make sure you verify that they are before you buy if that's important to you. (& there is no circ pump.)
2) When we wet tested the first night, the display said 102 and did not feel all that warm. When we tested a second day, the temp was set at 102, the display said 105 when we got in, and it subsequently went up to 106. May have been a fluke but you never know.
Warranty was 5 yrs parts & labor on all mechanics, plumbing, etc. 7 or 10 on the shell (I forget which). They said it was the standard Caldera warranty, but did not go into great detail.