I am a member and it's great. To clarify... it's not about giving tips on how to save money, it actually gives you access to pricing on hotels that is not available on public sites like Expedia and such. I've done a ton of comparisons and most of the time I save against those public sites. And it works for other things apart from hotels, like cars, cruises, flights (not a ton of savings there) and even activities if I recall correctly, so if you can book it on a website, you can book it on the travel secret at a discount. And yes, they also have access to unused timeshare inventory and they have a ton of options all over the World.
I've used it on a couple of trips already and recouped my investment (a business trip and a cruise I booked to take the wifey).
I'd recommend it for sure.