Traveled on Ijen, of the pros I note: convenient transfer (large car, water, comfortable driver, all paid on the road, do not have to pay anything and nothing to think about), good time management, support in chat, different payment options and instructions on the road + nice food (Everything but the chicken)
About the trip itself: the climb is quite long, if you are not physically prepared, then you will get tired of walking 100%, I needed a break
I took warm clothes that I did not need (at the top was +15), the view very beautiful opened up, ascent and descent was together with a guide, he showed the way and gave insurance
In general, the views are very beautiful, worth a visit
Now about the cons: when we went up there was a strong cloud and the lake was not visible (after a couple of hours the lake appeared), because of the rain the road was slippery, down to the lake only one of the group came down
David Eritsyan