Access to the oil filter with the Plazmaman is horrible. Impossible to get to from the top, can only get it from underneath. And if your car is as low as mine, you'll hate it haha. Even checking the oil level is a bit of a bitch now, be prepared to lose skin on your knuckles getting the dipstick out! Also forget about ever adjusting the IAC valve again. Not sure how bad it is on the standard 25 design, but if it's anything like the Neo then it is actually literally impossible.
To sum it up, the only real definite advantages are looks and ease of access to the spark plugs and coils. Everything else is made a fair bit more difficult, so it kind of cancels out. That said, if I could go back I would still do it again. The looks are a pretty big advantage