I've had nothing but positive results so far with Champaign Dental, but I can see how they might get pushy with people who aren't familiar with what their insurance does and does not cover. Case in point: they keep sending me notices for 3-month updates--I don't know of ANY dental insurance that pays for 4 dental checkups a year!
Like Heather T mentioned, Champaign Dental uses a more thorough check-up system than other dentists I have used, which includes measuring the density of your teeth to check for cavities. This may explain why many people who haven't had cavities before find one when they go there (or it may be a scam, who knows).
I really enjoy the dental hygienist I see. Her technique is great, and my visits are quick and painless. Dr. Kuo is great as well. I have an extremely rare type of dental bridge, and as he's the ONLY dentist in town who has any experience with one, I don't really have the option of seeing anyone else. If I had other options I would probably explore them, but as long as I know what my insurance covers and am firm about what treatments I will and will not accept, I haven't had any problems.