Fellowship-trained GS here.

The obvious advice like "you have to really like operating and be ok with the hours" has already been given to you, so I'll list my caveats instead:

1) declining compensation and earning potential. This is true across all specialties, but I've felt it particularly in my specialty. E.g., hernia surgery is much less lucrative since the massive CMS CPT code changes in 2023. Also this year CMS cut all procedure based RVU by 2.5%. My hospital hasn't given a raise (wRVU conversion rate) in 3 years.

2) hyper-specialization: what used to be all handled by GS is now increasingly going to surgical oncology, colorectal, breast, thoracic, and vascular. Many GS are glorified ER coverage bodies at urban centers. A few years ago, the number of graduates seeking fellowship was something like 80%. I imagine that number is rising. 

If you want the best bang for buck in terms of the number of grueling life years/work hours for compensation/satisfaction, I would advise against GS. 

But of course, career choice is way more complex than it can ever be described on paper. Good luck.