We advise you not choose the sites or companies with very low price, we indeed know how they treat your account, we called them NPW(non professional working).
I'd like to show you their tricks:
1: For lowering the price,they don't use a proxy during the power lvl,the chinese ip adress would be tracked by the game master simplely.
2: Their employees are not the professional players, they don't know how this biz work at all, most of them don't know english, it is very easy to be reported by other players, and your accounts get bannd or stolen by these main reasons
3: Besides, for geting more benefit, the gold or gears produced during the power lvl will be taken away and sold out by them, your accs will get banned cuz of online trade easily
4: What's more, some of them use Macros or bots to lvl for you, i think all of you know how seriours it is. Your accounts will get permanent banned and that's would be very big loss to u
We despise this kind of money making which ruins the fame of this field very much.