While you can buy from banggood you need to remember that you will get no backup if there is any problem. If it goes faulty you will have to return it to China and hope they will fix it, chinese warrenties are rather doubtful. If you are willing to pay the extra to buy it from t9hobbysport (UK dealer) you get a full warranty and will get any problems dealt with in the UK.
Jim
Sometimes the extra cost is not worth it, AKA warranty, because these days it is cheaper to replace an item with new.
If the extra cost is for a warranty period, not worth the cost because it will usually last that period of time any way no matter who is the retailer.
Not to mention that the warrantor has to still be in business if you need to make a claim.
It is why brand names don't mean much these days, most usually come out of a couple of factories with different badges.
So don't be put off buying from overseas sources.