I had the cali rechipped about 4 months ago (thanks Dave from NZ Performance Tuning). They did a great job ... improved drivability esp grunt in 2nd/3rd gear around 2,000 rpm. Towing uphill is great and am amused by the looks on hot hatch drivers faces when taking off from the lights.
Having said that, I'm conscious of the risk to other parts of the drive train by thrashing it so went for a balanced tune (not overtly power focused) and find the increase in torque more useful. I try to drive it sympathetically, not like I stole it.
As the van is 3 tonnes, the difference is well worth it. I love it.
Cheers