I think you'd be five with any driver that is less than 10 years old. But what I would say is if you can find a launch monitor, some people have very high or very low spin with driver. And dinner drivers really accentuate that. For me, I'm spinning my drives really low, so my radspeed is really unsuited to me. But rads are going for like 200 online new, so if you're a high spinning drive person (like a lot of people) it would be perfect. That's the kind of research I'd do. While often swing speed and spin are connected, they can be divergent. And it can fuck up your enjoyment of your new driver if you get it very wrong like I did. It's one of those unlikely problems but something to consider.