Syvecs is definitely a sledgehammer to crack a nut.... but what a sledgehammer. If you have the money to do it then I don't see any negatives to fitting it. Your car will run better, safer and everything will be controlled via the ECU. You can have traction control, boost control, launch control, etc all in the one neat little package.
The money you could potentially spend getting all those little bits and bobs done would add up quite quickly.
Your car will also be future proof, should you ever change your mind about going single, with probably the biggest spend towards going single already covered.