You're going to get a lot of different opinions on the rifle. I got mine second hand from a friend who was fed up with his. That was back when the 25 round mag was still "legal" (until some idiots at Mossberg decided to team up with Duck Dynasty to make a pistol version that took the same mag). So I had mine with the 25 round mag, and it was horrible. I later realized that it was horrible not because of the overall design of the rifle, but because that 25 round mag had so much movement and wiggle room that it would constantly cause FTF/FTE.
Once the pistol came out, and a notice was issued about the 25 round mags, I got myself a bunch of 10 round mags (the small ones, not the ones with the big ugly brick of plastic at the bottom to make it look like a STANAG mag), and noticed it fits nice and tight, and doesn't move at all.
Since I've been using those mags, I've put about 5000 rounds through it, including the super cheap stuff, with only a handful of FTF/FTE issues (to be expected), but some people I've talked to think it may be because the spring has been broken in, but who knows. If you do decide to get one, use the 10 round 702 Plinkster mags on it. Not the 10 round 715T mags, as they have that big useless plastic brick on the bottom to simulate a STANAG mag, that causes the mag to wabble in the magwell.
Overall, the 715T has been one of the lowest maintenance rifles I've ever used. Of the 6000 or so rounds put through it in total, it's only been completely taken apart twice and fully cleaned. Once by my friend, and once by myself. I'm not gonna lie, it's an absolute pain in the rear to take apart. A lot of tiny screws keeping the clamshell body together, and there are stories of some of the screws stripping. One of the (I believe) 12 screws has stripped in mine so far.
But in all honesty, just keep the magwell, ejection port, and bolt area clean, and you're pretty much good to go. The internal working parts, for the most part are centralized in that general area. Keep it clean and lubed and you're fine. Also, the barrel is easy to clean with a bore snake pull through a few times.
The rifle is plastic, and needs to be treated as such. It's not brittle plastic, but it's not Tavor quality plastic either. For general plinking, it's perfectly fine. If you do decide to get one, I would suggest the flat top over the carry handle model. You cannot remove the carry handle off of that model, as it's part of the body, but the flat top features a rail that you can attach one if you like, or attach any other optic. And get one with the telescopic stock. Some models have a fixed stock. The flat top version comes with a surprisingly good quality set of iron sights, that also help add a bit of weight to the rifle. I have mine co-witnessed with the iron sights and an Airsoft "EOTech" clone. Works pretty well.
The accuracy on mine tends to be hit or miss depending on the ammo. Find what yours likes to eat and stick with it.
It's not an amazing rifle, but it's certainly nowhere near as bad as some people make it out to be. It is by no means my go-to SHTF rifle, but it's been a lot more reliable with the small 10 round mags than some of the more expensive rifles I've shot.
I also have a friend who wants to start a little metallurgy project of his own by replacing the current plastic clam shell, with a custom made aluminum one. No ETA on that yet, but it seems interesting, and ambitious. If all goes well, he might consider selling them to the public as an aftermarket body to replace the current plastic clam shell.
