The service is very fast to respond if you have any issues or questions they are always willing help!The price of speed optimization for my site was quite cheap compared from other competitors so I decided it's worth trying them out as well! As far that i know there isn't anything bad about this product yet but maybe in future when more people use their products then problems will arise like slow loading time etc..I'm using word press website optimizer which gives me some results however not all websites work perfect at first try (sometimes need few tries)but after optimizing your page loads faster than before even without having plugin installed!!