Cummins ISBXT owners

[enduroman]

We're about ready to pull the trigger and upgrade our 2008 Southwind to a DP. Fleetwood is very strong in this area so probably going to end up with a Discovery. Most units we are dealing on are 08 or 09 with the 350 hp ISB. The local dealer also has a new 2008 Excursion [with the Cummins ISC] but my wife hates the floor plan. We've also looked at [via the internet] a 2007 Discovery with a Cat C7 but it's 1700 miles away.
What are the real world experiences with the ISBXT in 40 foot coaches. In test drives it feels like a rocket compared to our 21k lb 38 ft Southwind but I don't want to make a $97k mistake.
Thanks for any info.

[GWCowgill]

From all the research I done when I bought my 09 DP Bounder, You will find the Cummins is cheaper to maintain than the Cat. A Cat mechanic also told me to stay away from the Cat. You may find others who disagree but Cat has gotten out of the over-the-road area.

[jth camper]

I've had my 40' since October, I'm overall happy with it. Although I wish it had a little more power in the hills and mountains of CA.