I own a Twizy for two weeks now, and have decided to remove the anti roll bars and give it a try.
It's an easy job that takes less thane 30 minutes. I have to say that the change is dramatic, in a positive way. The Twizy now actually has a suspension! Leaning during cornering is acceptable and more car like now compared to the kart like behavior before. The big plus is that suspension is now really independent, and a bump under one wheel is no longer transferred to the other wheel by the massive anti roll bar. Compared to the average car, the suspension is still sporty and I can still take roundabouts at high speeds.
I did consider to order the Ministromer rubber, but all they do is basically the same as removing the bars altogether. It will allow one wheel to move independently of the other more than with the bar fixed the original way. The main design flaw I see is that an anti roll bar should work as a torsion spring, but since Renault fitted a bar that would do great on a van under 450 kg car the thing can never work as a torsion spring. I would recommend to give it a try, and if you don't like it just put them back.