I got a used GT (2014 GT Timberline 1.0 29r) a cpl yrs ago that seems similar. short travel spring fork, mechanical disks. I got it used for $200 & have been having fun with it. (it's my 3rd GT, the 1st 2 were 26ers w/ rigid forks)
I've learned what it is & what it isn't. a cpl years ago I was able to keep up with a friend w/ a better bike & I may be riding with a new friend soon & I'm hoping I can keep up! I guess whatever you decide on, is OK, so long as you know what you have & what you don't. I think buyers remorse comes from not enough research or test riding. someday I'll afford a better bike, but right now, I'm riding what I got
swapped the fork last spring. same model just a little longer & no squeak. reworked the rear rack. the plastic platform finally broke enough that I was tired of repairing it. and the long rack stays that I made myself weren't necessary so I took them off
it is a beast to carry out of my basement for every ride. I'm so happy when it's light road bike day! but I've been having a blast with this entry level cheapo