Hey guys! I've read some posts in front and I noticed people mentioned Brett Manning.
I personally have had lessons from Brett Manning's associate, Jesse Nemitz.
I would have to say it pretty much wasted my RM 900. Two lessons. I'm that hardcore on singing lol. Eitherway, lucky me I didn't BUY the program. I downloaded it online lol. So many people uploading it onto the internet =\ A google search = done.
I don't mean to bash on Singing Success or rather it's source, Speech Level Singing which originated from Seth Riggs. Not only did it not give me range, tone or vibrato, it wasted my efforts and money and time. -.-" To be honest I was VERY disappointed having high hopes. However, it DID allow me to find my head voice.
Singing Success does have some incorrect technique. In singing, there are plenty of schools of singing. The main school that are the real deals, are those that originated from bel canto.
However, Singing Success' approach to singing DOES help some people. For me, it doesn't. Everyone is different

. Though speech-level singing which focuses on bringing your head voice down to your chest voice and not building up your chest voice will really make you lose your upper-mid belting sound and you'll have more of a pop/light/RnB sound. Want a big sound? No way.
You say they have students like Hayley Williams? Hayley Williams had that voice before Singing Success.
A good example to people who lose their power through Speech level singing is Michael Jackson. Listen to MJ's early songs (when he was young) Then listen to his current ones. He did lose a LOT of power. It was sad :|. MJ took lessons from Seth Riggs, the original founder of SLS (speech-level singing)
I found Ken Tamplin after failing on Singing Success. It literally helped me a LOT. My range? I can go up to a A5 / B5. Properly connecting from Chest voice to head voice. I'm still learning to develop a mixed voice which gives the more Pop kind of sound.
I'm not advertising Ken Tamplin Vocal Academy, but rather, I have been through the pain of about 6 months of wasting time every single day doing Singing Success and I don't think anyone should feel that way lol. If you're gonna invest on some singing program, do it at KTVA. It's really worth every single cent. It's a bit costly, I'd have to say. But worth it. 100% money back guarantee if it doesn't work for you.
I got the gold bundle which is like roughly RM 2k? @__@" But super worth it. Considering you get 3 free lessons with Ken Tamplin as well which cost like RM 590 each -.-"
Ken also has free webinars from time to time, heck, while typing this I'm in one LOL. He's talking about hyper glottal compression. So yeah.
Here's the website :
http://kentamplinvocalacademy.com/Forums :
http://kentamplinvocalacademy.com/forum/(I'm known as Kokonuhtz on the forums, am a Moderator there)
You can google Ken Tamplin and see all his albums, records etc etc. Youtube him and you can see him teaching other people. All the real deal.
Feel free to ask me questions! This is my review on KTVA btw :
http://forum.lowyat.net/index.php?showtopic=2557316&hl=Thanks for your time XD