for the package, i don't see why it won't work. i use an fs-i6(w/ 10 ch mod) and vr-d2 myself. both are worth the money.

but if you're a 1st time flyer, i would suggest don't start with brushless. more damage when you crash. can be quite dangerous to you and your surrounding when you panicked.

but if you have experience flying, should be fine.

Another option get indoor micro drone for first try. Damn fun for a start. Once you get used to FPV than only invest on bigger quad. eFlight inductrix FPV from USA is a good beginner micro drone   

as long as you don't have to think where to move the stick, it should be fine. as in, you can go back to tail-in hover without thinking what to do in a panic state. 

yeah, i've been having problems with battery shipment as well. wonder what is happening. no issues, last year.

for 3s or 4s, that depends on the entire equipment. you need to know the voltage rating. for example, the quad's ESCs and motors might support 4s, but the vtx might not.

yes, you can use any lipo batt with the same dimension. just fix the proper connector and make sure it's not too heavy and alter the CG too much.

flight time? a 250 racer with 1500mAh batt, is still around 6-8mins of flight (batt at 11.1v during flight).

AP drone hover because attitude hold and the thrust can hold it's weight.

Racing quad normally not equip attitude hold (barometer)
Because normally nobody hovering 'racing' quad.

not sure what you are flying, but if it's a phantom, then it's like the manual mode.

most photo drones can hover without stick input because it has a barometer, which allows for altitude hold. these usually have spring on the throttle stick. again, like a phantom.

race drones don't have spring throttle. so the stick won't stay in the middle. depending on thrust and weight ratio, you will have to move throttle to maintain altitude. but you can still have altitude and gps hold given you have the proper flight controller.

You can hover it by control the thrust stick.
Like driving bike or car.. it just not hover itself(if not equip barometer)

I own both Flysky Th9x + Frsky DJT  and  Flysky FS-i6X.  Th9x is classic old radio but good for professional long range FPV flight with FRSKY DJT module, great for modders.  FlySky FS-16X is new radio but very limited to park size flying and good for beginner because its radio range and AFHDS2 is limited.  If you're serious flyer go for TH9X and with DJT module.  If you're into park size micro drone racing or just normal flying/ training and easy to work on the function around the radio the FS-i6X is good.

I always teach my students using FS-i6X at my R/c classroom. But for professional adult the TH9X does better...yes great old budget radio too.

did you buy with battery? do let me know whether it arrived timely. at least i know banggood is having issues shipping batteries here these days, so am really curious if other sellers would have the same problem. i lost a qx90c in the mail and ended with a refund. of course a refund means you still loose money as the bank charges for conversion rates