Yay I am the first to share an opinion! OK - I consider these guys average, and here's why: First of all, they do have the best slow-release granular fertilizer, hands down. Also their grub control and flea & tick treatments are the best in the business. Their weed control is so-so, good for common weeds like dandelions but if you have something like ivy or thistle, well you're not getting rid of it.
Also, their staff does seem to really care about making sure your lawn looks good. They offer free reapplications, will come out at no charge to evaluate a concern, and will fix their errors. However I think they are disorganized, as service calls get forgotten or rush reapplications get suffocated under other paperwork.
In summary, if you want a great product, these are the guys for you. If you are looking for the best in servicing your needs promptly and efficiently, well perhaps there is a better place out there. And if you want cheap then GO SOMEWHERE ELSE. They are more expensive but remember you get what you pay for!