I went for the tip box in the 997 turbo when I bought my car last September and have no regrets. It's like having 2 cars in one - a comfortable cruiser when you are in town or on slow moving roads, or on the motorway, then it turns into a beast when you open it up on back roads or on the track. The turbo has a lot of torque from low down in the rev range so even when you use the tip box in manual mode (ie driving using the buttons on the wheel), you are not changing gear very often anyway. You are shifting from second up to third and back down to second, because the car goes so fast in the lower gears. I also love keeping both hands on the wheel and focusing on the feel of the car through the bends. Also, I have heard people complain about the manual turbo because of what I just mentioned - you don't have much need to change gears. So, if you are someone who feels that driving is all about the gear change, why not get a manual C2s or C4s instead? That way you'll be changing gear more frequently to get the most out of the engine, if that's what you enjoy about driving. For me, what I enjoy about driving the turbo is its ability to terrify me with the sheer force of the acceleration.
In the past, on track days, I have always driven a manual. I recently took the turbo tip on track and didn't miss having a manual box at all.
Ultimately, everyone is different and enjoys different things about driving. But I would say: Don't let other peoples negative views on the tip box put you off because they think of themselves as 'driving purists' - drive one for yourself and make you own mind up. A lot of people who ordered the turbo when new opted for the auto box (which says something in itself) so there are a lot more autos around. The manual cars are very rare. So, the tip is a bargain! I think you are getting a hell of a car for £45k.
Last Tuesday I suffered a very bad knee injury in my left leg whilst playing football. Right now I'm thanking my lucky stars that I bought the tip!
If my knee recovers (at the moment Its completely immobile) and I can one day afford to add to my collection, I would buy a naturally aspirated manual Porsche, so that it provides a completely different experience to the turbo.
At the moment, being a one Porsche person, I love the flexibility of the turbo tip. It can be used to take the kids to their clubs, to go do a food shop, go on a golf trip, but also to drive like a maniac on track. I don't think many other cars can do all of those jobs so well.