Hello. First post here. I am looking to get started with FPV drone flying as a hobby. I have tentatively identified DJI Mavic 1 Pro or Platinum and Phantom 3 Advanced as two models that should be good basic flyers, not cost me a bundle to get started, and that probably won't leave me feeling an urgent need to upgrade in short order. I have posted several questions on the Mavic Pro in the Mavic Pilots forum, and gotten answers to serve as a basis for my pursuit of a used drone. I do have a few initial questions specifically regarding the Phantom 3 Advanced. First, I see (mostly older) threads on this site about DJI deliberately crippling the Phantom firmware so as to prevent flying with non-DJI batteries, OTOH, I see a number of compatible batteries listed on Amazon for $50 - 60 with quite good recent reviews, and no mention of this issue. Is this still a potential problem, or something that is now completely in the past? I also see an issue of cracking of the structure at the base of the motor mounts. This seems to have been common at times (possibly a bad batch from the factory). Those threads also seem to be fairly stale. Is there a current consensus on how to prevent this problem from occurring, and the best remedy if it has occurred? Finally, there are two local (I won't buy any drone unless I can see it fly, in person) Phantom 3 Advanced examples listed for sale on FB Marketplace. First, one for $300 for a unit with spare props but only one battery that claims little use. Unfortunately, so far the seller is being coy about a demo. Second, one that claims to have only been flown once (nearly NIB) with two batteries and a case for $500 (recently reduced from $750). I did a quick scan of on-line offerings, and both of these units seem to be fairly priced. I'd like some thoughts on that from experienced flyers, as well as any other pre-purchase advice you might deem appropriate. Thanks!