Should I even try upgrading the firmware?

New to this forum, and the idea of upgrading to a different firmware. I apologize in advance if this post is mislocated or already answered. There's so much to take in when researching

I obviously have the Netgear R6250. When I first purchased it (Approx 10 months ago) I thought it was a pretty good choice for the money. After all I was upgrading from a much older N300 router that was working perfectly fine. The range on the R6250 isn't as good as the N300 and the speeds are nearly the same (which was shocking to me). I probably reboot my router once a week because the network freezes up. If I watch Netflix on my chromecast and my roommate watched Netflix on an android tablet the network will either freeze up, or everything buffers (well, for netflix the video quality becomes almost inable to view). Anyway, the network feels like I slashed the quality in half moving to an AC1750 (r6250) router over a N300 router. My biggest hopes from all of this is a stable wifi network, good speeds, range and the ability to handle more than 2 or 3 active devices at a time. 

After reading about these Firmware upgrades and the ability to control so much more of the routers functions, I thought I had hope of recovering my wifi performance and not being the one that made the poor router choice losing us money. Unfortunately there's still limitations to what this router can do/handle. I thought I could use one of the much talked about firmwares (DD-WRT, Tomato etc...) but the R6250 is not supported *bummer*. Then I stumble on this site, which gives me some hope.

After searching through different posts, reading articles etc. I have questions.

Is it worth upgrading the factory firmware for a different firmware?

Is the potential performance increase and reliability of the network noticable?

I keep reading a lot of posts referring the builds being unstable and glitchy ( I understand this happens all the time), is it stable enough that I would be happy with the upgrade? (Ex. Am I going to end up doing an upgrade only to spend more time fixing the software?)

With all of that being said (I apologize for rambling. I've had a little to much caffeine at the moment). Canl anyone lead me to the right place to find full instructions on how to upgrade the firmware from this site? I keep hearing pretty good things about Kong, but I end up at the site to download the firmware. For the most part I had the process down with upgrading the firmware using DD-WRT. Some of the posts here sound like there are more steps to complete the upgrade and MUCH higher risks of bricking the router. Same as DD-WRT there are so many builds and versions it seems. Any suggestions or guidance would be greatly appreciated!! 

Oh...and if I were to upgrade this router what would you suggest that reasonably priced? 

Thanks in advance for your help. I do greatly appreciate it!! (Next time I will try to limit my caffeine intake ahead of time haha)