I have never climbed anything like this so it was a lot of fun and a good challenge.There were a lot of butterflies, saw a waterfall where you can have a rest for a while. It was quite soothing. I didn't get to the top as it was approaching dark around 2pm, but I'll certainly be back next attempt to finish.
I went through an unofficial entrance (Seafood restaurant) and was charged 8RM. However I walked out via a 'hut' which is actually the Park's entrance that only charges 3RM, and it was a 2 minute walk from the Seafood restaurant. The officials also informed me that if anyone were to go missing, the private companies wouldn't necessarily go out and search people. And I'm sure the money charged wouldn't go towards the forest. So not only it's cheaper but much safer. Look out for the little Sarawak Forestry official sign on the road, next to the white shed.
Also bring lots of water. There's a restaurant nearby but very expensive.