Hi Garry,
Everybody else pretty much covered the other bits.
As to where I'm coming from - my background is in journalism and advertising. As such, I believe I have a fairly good understanding of how readers interact with text and what affects them both positively and negatively.
Some examples of errors:
"Our Qualified internet marketing experts are available to improve your company's fortune online using many different online based marketing techniques. We have proven results from years of work in Internet marketing and have a wide range of clients in many different industries."
"Our service is geared towards providing small to medium sized UK businesses an affordable solution to SEO."
"Contact us today to gain an insight as to how we would manage your company's SEO campaign."
"Plus more importantly help deliver your company a good return on investment."
There are quite a lot more and a lot of poorly constructed sentences that stop the flow of your message ...every roadblock like this that you put in front of the reader will reduce comprehension. If they don't understand the message they are unlikely to convert. 
Hope that helps.
Sha