Well it depends. It's not to say you got to refuse offers offered by Astro. Some is good, some is plain money-oriented offers, some is useless ones.
Here's a word of advice. Although some offers that offered by Astro sounds like a great deal, but in another way round, Astro is expecting something in return from the customers.
The best example is the HD+PVR service. So whenever Astro offer you any kind of promotions and offers, it is better that you do some research on it, such as asking us in the forum here

So that at least we know what kind of fishy stuff is going on Astro, and give you a feedback and opinions just like other forum users do. And also, don't forget to ask for T&C from them, instead of blindly accept whatever offers offered by them.
Another example, Astro give you free preview of a particular package(s) or perhaps HD channel? Obviously they want you to get hooked up by the programme/content of the channels in the package. If you like the content on that channel, it will make you feel like want to subscribe to that package, so eventually when you subscribe it, Astro earn money... See the trick here? Hahaha...
its true , love only 2 content out of 6 ... thats the way they make money