2007 Peterbilt 357 C15 ACERT Advice

I'm in the process of purchasing a truck for my roll off business. Here are the stats:

2007 Peterbilt 357
Cat C15 ACERT freshly rebuilt (MXS serial twin turbo)
18-speed
600K on the chassis

I have heard some sketchy things on the motor depending on the serial but apparently this is a 2006 engine with the MXS serial prefix. I have heard this is good but I have also heard the ACERT twin turbo engines are not great. Is this a risky purchase? So far the seller has been very forthcoming with everything and has agreed to drive it about 20-30 miles to the Pete service center so they can do a complete inspection for me; at my expense of course. That means a lot to me. My current truck (2005 Mack Granite CV713) has been an absolute lemon though so I'm a little gun shy. Thanks for any advice.

 

I will clarify the truck is supposedly a 2007 with a 2006 build date. The engine build date is also supposed to be 2006. Apparently this truck does not have a DPF.

 

That's good to hear and I have received the same answer from other sources as well. That definitely makes me feel more comfortable about buying the truck. Thank you.