The Mountune kits have a much better power curve and they are actually quicker than most other (comparable) tunes, even though it might not seem so on paper. Also they make their advertised power and proven to be safe.
Your not going to safely get 50hp from just a plugin device and no physical upgrades lol. If you dyno it, it will probably fall way short and have an awful curve. While possibly being harmful to the engine. If they were any good serious tuners wouldn't spend so much money on doing things properly.