I see many different U818A's listed by different sellers who put their name on them. I see USA Toys, Holy Stone, UDI, etc... is there any difference? https://www.amazon.com/gp/product/B00D3IN11Q/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=APOHCVIODKAVC https://www.amazon.com/gp/product/B01HE18R1Q/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=AEQF4HVNPT5Z4 https://www.amazon.com/UDI-U818A-HD-Headless-RC-Quadcopter/dp/B0108UXWK6/ref=sr_1_2?ie=UTF8&qid=1480182329&sr=8-2&keywords=u818A https://www.amazon.com/Holy-Stone-Quadcopter-Headless-Function/dp/B01IMR6BLO/ref=sr_1_22?s=toys-and-games&rps=1&ie=UTF8&qid=1480182404&sr=1-22&keywords=drone&refinements=p_85%3A2470955011
Most are the same basic quad - those who just want to learn how to fly can buy the most inexpensive one - sometimes less than $40. The more expensive ones contain some additions - for example, some have a barometer (altitude hold). Others have FPV which uses your phone and an app to see what the drone sees. Some come with other extras as well as a FPV goggles which use your smartphone. All in all, if you are just trying to fly around and learn, you are probably fine with the models in the $40-60 range (without a lot of options).
