Chair is awesome. The up and down lever should be pulled away from the centre of the chair. This allows unlocking the spring to tilt the chair, no problem!
After only 8 months of use, one of the plastic arms holding the chair together snapped clean and half. Would have been a great chair if not for shoddy worksmanship.
If you have this chair, take care in leaning back.
Purchased this chair recently, took me about 30-minutes to assemble alone with the hex key provided. Chair is comfortable and fits nicely with my desktop setup (Although I wanted blue, I chose to take red as I did not feel like waiting). With Jysk's 20th Canadian birthday ($20 gift-card) the chair came to about $130 (before tax). Well worth that and would recommend this to my friends, whom all play PC games as much as I do.
Note: It does tilt but only slightly with the twist-able knob on the base of the seat.