The website has a boxed structure, I like wide view. It looks more elegant. Also your website should be responsive. Especially in this age where people use mobiles and tablets a lot than desktop computers.
You can check responsiveness here: http:// quirktools.com/screenfly/#u=http%3A//www.cellz.com/&w=533&h=853&a=24
Here is the screenshot of how your website looks
your sites load speed is pretty good. If you can use cloudflare (free) it will increase for sure.
Use Gtmetrix to analyze your website
Your website scores well in terms of SEO as well. check woorank
Also no need of the extra side banners popping from left and right. Just one is enough.