Wow, that is a fair old journey. The cost in travel knocks it out for you. Yes, don't even hesitate about the Power Box, it's just a totally different car and it's so easy to install.
I programmed mine to medium power, removed it and put it back in the box. You'd pay more than Kenneth is asking for the performance upgrade at a garage (if they knew what to do) but you have the advantage of reprogramming it back to standard or have a tweak to how you like it. Just the best accessory ever for the Twizy.