Is the Ace any good?

I just unlocked the Ace but its bonus makes no sense to me, it has increased Top speed at the start of the race, but the boost runs out befor it hits its top speed? xD Is it useless or am I missing something?

I just unlocked the Ace but its bonus makes no sense to me, it has increased Top speed at the start of the race, but the boost runs out befor it hits its top speed? xD Is it useless or am I missing something?