First off let me say I love the quality of grav products. I also love the quick and courteous response from the customer service reps when I notified them my orbis lume arrived slightly cracked and the mouthpiece broke fairly quick. They issued a replacement immediately... unfortunately it was this piece they sent to replace lume.
So now I am going to review the sphera, of which I am not a fan of. It is very unstable and is easy to tip over due to the small round bottom it sits on. Totally opposite of most orbis series bases. All in all it hits well, but this isn’t a piece that I’ll use due to its ability to knock over so easily.