
Internal stability is the best of the three $35 models I've used. The other two models are BCP's X5SW-1 and Syma's X5C. The Air Defender is especially good for beginners with less reaction when hitting objects at lower speeds and full-length soft-blade skid plates that offer relatively soft impact against objects like walls and ceiling fans. Outdoors this isn't very good due to the higher drag of the blade guards. I give the other model (X5SW-1) a 3 star (average) 5 star rating and Symas X5C a 5 star rating.