In my opinion the Lenovo Explorer is a fantastic headaset at a wonderful price. It is a steal at around $250 and offers LOADS of value. The visuals are fantastic and better than Rift and Vive. Even the FOV is comparable to the other headsets.
But the biggest plus must be how comfortable it is and how awesome it is to be able to just turn the visor up to go back to reality if you need. Really can recommend the device. But yes, there is no IPD adjustment.