not if the experience is given by Waheguru...
If all our focus is solely on the ridhi and sidhi then yes, of course this is against Gurmat...the ridhis and sidhis then become a distraction and one seeks to use them for their own benefit..
But so far in my own journey, i have realised many things...sights, sounds, other things i cannot explain...this is certain to happen because you are becoming 'aware' of all these things on the journey...
But i can only say that focus has to remain on the ultimate destination...even in the spiritual planes the 5 thieves can influence...
A lesson I applied in meditation:
I had jumped out of my body and went to turn the light on in the hallway of my house. My house was filled with Mayadharis so it had a negative energy in and around it.
I flicked the switch and realised a demon had cut the power, it stayed dark, it was trying to scare me. I felt it coming up the stairs and I thought, it wants to kill me, and it will this time. I was a newbie and was very scared. It tried to paralyze me (as they had many times before).
Suddenly I felt a wave of calm and I remembered gyan I had been told about Nirvoah and Nirvair. I laughed as the demon approached the top of the stairs, I sat down relaxed and I said, Oh God, I know its just You dressed up as this demon. White light came and I woke up.
Gyan put into practice. You learn lessons you can apply in your daily life.
Your friend backstabs you, it's just God, your spouse beats you, it's just God. Gurus were tortured and killed by fools, their murderers were just God.
Hence they remained Calm and in Chardi Kala.