Cummins X15, what's the word?

[MXinIT68]

Been looking for a new truck, and because of the popularity of the Volvo and Freightliner products with their corporate engines ( sold out ), there are some units out there with X15 still available. Ive had bad experiences with anything ISX powered and knowing that the only way this engine lives is because of this site, would the X15 be a good alternative?
What are the weaknesses?

Thanks for any and all input in advance.