There are two LeNest models floating around. One is basically the BoboVR Z3, as /u/3015 mentioned, the other is it's own model.

Z3 variant

other variant

I have tried the OtherVarient, also goes by "Fiit" and other names. It is ok, but isn't super comfortable. Also, it's sweet spot is very small. I haven't tried the first, but if it is a direct rebranding of the Z3, then it's an ok viewer...if your phone has a 7 inch screen.

I am looking to get one for my 6p and was looking at this

http://www.amazon.com/gp/product/B01B4KS8QC/ref=pd_lpo_sbs_dp_ss_2?pf_rd_p=1944687682&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B01CPIEOJM&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=03A9M368NTGWA5DCSF0J

I cant seem to find the z4 though, where do you get it from and why would you suggest the z4 instead?