Gartner is worth relocating for- all the effort you'll put into moving, training, mastering your role, etc will bring you so much personal growth. If you can make it here, you can make it anywhere.
My advice is to go for it. If it's not a long-term fit for what you want to do/where you want to be, you can make a change later. There are a lot of great people who work here, and Fort Myers really grows on you.
Gartner brand, benefits, industry