Really depends on what you're after, but the Invader 7 is a really good pickup. I would probably do the upgrade if it were me. Just keep the stock pickup on hand to swap back in if you ever decide to sell the guitar
It would be a great upgrade if you love what the Invader does...have a ton of output with a lot of mids. Lots of people love the Invader, and it certainly looks cool. It might not work if you like cleaner styles, require touch-sensitivity, or have a mid-heavy guitar.