I've had similar problems where I work and travel thru with spotty coverage, and also wanting to increase my coverage. I don't have any experience with that product but I do have a bit of experience with cell amplifiers. Here’s some information that I hope will help.

http://www.wilsonelectronics.com
In my own Opinion they have quality products to fit your needs for permanent and on the go applications. I own several of their amplifiers. My first amp was the dual band direct connect (Wilson Cellular Product 801211). It really does work; I held cell service MILES outside the area of an unassisted phone. Frequently traveling over the passes and up in the mountains I maintain signal much further into the hills.

I recently bought the wireless dual band amplifier (Wilson cellular product 801212). Most new phones do not have a direct connect antenna port so you would want something like product number 801212. The range away from the inside antenna is only about 5-8 feet. So if you are looking for an inside application it won’t work as well, but it will work within a small room or office. A phone with Bluetooth can help with to some degree of freedom to walk around, if you can stand one of those things in your ear.

Wilson has some good info on their site to open your phone and see your actual signal reception in db.

One of the side benefits is prolonging the life of your cell battery since it does not have to use max available power to transmit its signal. If you have Broadband Cell modem it really helps the speed of upload and downloading in the fringe areas.

All in all in my own opinion I think this company sells a quality product that works.

http://www.wpsantennas.com
This is a good website that sells Wilson products along with over manufacturers similar products. I have used them in the past for researching on buying the Wilson products. Their prices might be a little high compared to those on Amazon but, doing business with this company in the past has not been a problem.

Hopefully this helps.