I got considerably further, limited mostly by battery life, but only after forcing the BB to 2.4 GHz and configuring it for US settings, which technically, is illegal as EU tx power is more limited. With the xiaomi router I get further too, about 1.5 Km, and its legal, at least in so far using a wifi router outdoors is legal, which it may not.
As illustration, here someone achieving almost 5km:
Again, I cant say I agree. However, you have to make sure you connect the SC to the BB using 2.4GHz and your phone/tablet to the SC using 5.8 GHz. 2.4 has far better range, and if tablet and SC are on the same frequency, they interfere too much. The first tablet I tried only supported 2.4 wifi and the results where not good. But switching to a 5.8 capable one and configuring accordingly made a big difference.
At longer range, it probably is more glitchy than the phantom, but closer by and when it comes the actual image quality (FPV), Im not sure which one is better. At least compared to the advanced, the professional will beat it handily.
BTW, on the phantom I have yet to lose the video connection, but my control link is limiting me and frequently cutting out at 1 Km or sometimes less. Which is kinda odd.