I could write a book on my mistakes in negotiating pipeline ROW agreements.
First, get rid of John Smith the "lawyer", he is not working for you. My experience with lawyers negotiating these agreements for me has been poor at best. There is no substitute for doing your own research whether you hire a lawyer to help or not. There are resource online to educate you if you have the time.
Be sure there is a termination clause in the agreement. Best if it says the ROW easement will terminate in 50, 60, or ?? years. Otherwise it is a permanent thing on the title/ownership of the property. An alternative is to terminate the ROW if the pipeline is not used for it's intended purpose for 12 or 24 consecutive months. Be sure the agreement restricts the size, depth and number of pipelines (one and one only) in the ROW. Specify that there will be no surface facilities (valve sites, compressors, etc) other than cathodic protection and markers. Specify that the ROW is for use only for one pipeline to transport gas (or oil) and not for fiber optic or electric transmission or for any other use. Be sure to address what will happen when they no longer are using the pipeline, either remove at their expense and remediate, or cut, purge and cap. They will try to leave it in the ground and ignore it, then the liability will be on you.
There is much more, but more than I can go into here. There are several good web-sites that discuss this. Google things like pipeline easements, eaglefordforum(dot)com, gohaynesvilleshale(dot)com, mineralrightsforum(dot)com and do some searching and reading. It will be time well spent.
It is hard to say what you should ask for in compensation, but at least ask for double or triple what they are offering. Just be aware that if they are an interstate pipeline co they can use eminent domain to force you to accept their offer, or an offer acceptable to a court. Most likely they will be willing to pay more than their first offer just to avoid going to court.