What do you think of this saddle pad?

I think that if the kind you already have is working for you and you like it, then you should stick with that kind. If you've had for quite some years, then your horse is accustomed to that pad. Switching would require your horse to maybe change his way of his lead or something of that matter. What I'm trying to say is that your horse has been used to one kind of pad for 5-6 years of his/her lifetime. Switching may lead your horse to discomfort for awhile since it will have to adjust to the new kind.