Imma say what I say to everyone that posts this question...
Exhaust every other avenue first... Try NG feeds, try upping the calouries, try everything possible before getting a permanent fixture...
(I did NG feeds for 3 years, but due to end stage CF I was coughing more and vomiting up the tube... and it was suggested to go the permanent route, which I did and wished I hadn't)
For some it works, for others it doesn't... for me it didn't...
Mine leaked non stop, my stomach was continuously raw from leaked stomach acid... I had it put in to gain extra weight to help with TX and in my case it worked in the reverse I lost more weight on it due to the complications and pain...
But if you made your mind up and it's something you want.. then go for it!
All the best!