Looked to same philosophy as you. I've upped mIne to 195*14 commercial tyres (on 1.6 CS i.e.. non turbo diesel) & it takes the edge off the "din" when cruisin' along.
It's completely fine on the flat, better downhill, worse uphill. Lower revs rather than better top speed.
Loading up/weight takes a bit more of a toll than before, but that's to be expected. Worthwhile swap in my opinion & wouldn't change back - Older Transit is 195*14 so reasonable prices.
**Bonus** - my speedo now reads bang on (per sat nav & road safety "smilies"), rather than a bit high as original. From memory gearing increase equivalent is about 3% (don't quote me on this). Would suggest you don't go jumping above this too much, unless you have large surplus of power as it wont pull lower down & you'll get fed up of using 2nd & 3rd rather than 3rd & top.
Hope this helps.