I don't think Sphere is anywhere close to being out of stealth.
IMO the enterprise storage model is under a complete overhaul.
It's unbelievable how many companies are being privately financed. Most of these newly formed companies have CTO's and engineers from companies like Red Hat, Cisco, Isilon and Dell. Hell one is even financed by Dell ventures. All previously claiming of coming out of stealth.
You also don't want to ask me where I believe the origination of these entities came from. I think you know my opinion.