I chose the 114 from new because at the time it was the only bluemotion option, and came with loads of standard equipment.
It is not quick by any stretch, but very acceptable to me.
Although it is the lowest powered California option, VW do transporters with significantly less power, which I am sure are fit for purpose.
Some might say I am biased, but genuinely coming from a BMW Coupe previously, it provides a comfortable and relaxed driving experience, even fully loaded with kids, bikes, and a fortnights worth of camping gear.
I have driven the 140 version too... It is quicker, but not significantly, but perhaps nice to have the extra gear.