Is it worth going for the bigger sign up offers?

In my opinion no.

Otherwise, depending on your funds in exchange etc you might and decide to go for it.

You need to have a way of estimating the value of an offer. For rollover I calculate that it is going to cost me about 5-10% of total rollover to complete. And if the rollover terms are particularly thorny ie multiples, high min odds then it could cost a lot more.

So if you have to bet 8 times deposit and bonus that is 8*(200+200)=3200. So I guess it will cost between 160 and 320 to complete the rollover backing and laying. So hardly worth it when at best you have 40 left from your welcome bonus.

Some say that they don’t plan on completing rollover but just want to lose to exchange. That’s a big mistake. You can’t plan to lose. If you know the bet is going to lose then just lay your house on it on the exchange. Nobody knows which bets will win or lose. But what about 20/1 or long shots they say. They are unlikely to win. But when they do you end up with so much money locked in the bookie and zero funds left in exchange to unlock it …..