i got suckered into the fancy new features of the maxx (led ring, metal button, etc..) and then read the initial troubling reviews and quickly ordered a riva before my maxx(t-rex) ever arrived from china. ended up getting the riva first. cosmetically i prefer the maxx, i like the silver accents, i usually loathe gold (gold cars, gold jewelry, gold anything) but oh well its not a deal breaker in a PV. well im glad i ordered the riva because not only did the battery come apart a couple of days ago but the damn threads came off the cone. i wouldnt recommend the maxx(trex) to anyone but ive already turned friends on to vaping and they've all ordered rivas. love everything about the riva but the gold accents and i can live with that. didnt even consider the ego b/c of the price, $75 for 650 with a troublesome button when i could get 750 for $20 less