Siddhis are a hot topic for some spiritual seekers. They were for me for a long time. In this post, we read the words of Zui on this subject:

The ultimate aim of Guru Siyag's Siddha Yoga, as mentioned on his website
www.the-comforter.org, is the spiritual upliftment of mankind. With
this lofty goal in sight, Guru Siyag speaks of the enlightenment and
complete evolution of the final three stages of consciousness (also known as
"Kosha" in sanskrit): Anand (Bliss), Chit (Becoming) and Sat (Being).

The Siddhis that you mention lie below these three levels. Though many of
Guru Siyag's disciples, including me, acquire Siddhis, we DO NOT become
attached to them. This means that we do not try to hold on to them and make
an exhibition of these powers. Guru Siyag warns us that doing so would
hinder our progress. By becoming attached to a Siddhi, we would limit
ourselves only to that particular state of consciousness and not evolve
further.

He suggests that these are just mere reminders of the immense and eternal
energy and light that we are. On the path of realization we discover many
precious stones. But if we get attached to only one stone we will never be
able to discover the vast treasure that lies ahead.

On his part, Guru Siyag too, does not exhibit his Siddhis.

So to answer your question: Yes, I do have Siddhis. I have been practicing
Guru Siyag's Siddha Yoga (which awakens the Kundalini) for the past 8
years.

Here, I would like to add that though I have Siddhis, I NEVER make use of
them. Certain Siddhis manifest themselves involuntarily by the Supreme
Shakti's command. I, as an individual, do not have a play in it.

My perspective

I have no siddhis as of yet. But I sure am ready to run my mouth on the subject:

I think Guru Siyag hints at his power. If you look at his 15-year record
of healing incurable diseases, it is a sign of tremendous power. From
what I understand, you could goto India and meet some students who
demonstrate some common siddhis. However, all attempts to record
levitation have resulted in the camera failing.

I have asked many groups about Siddhis in my spiritual search. Some dont
have them and try to downplay it. These are the weak groups who are not
tapped into unlimited power. Others are tapped in but mis-use them. Others (like our system) have them but have goals beyond the limited life span of this body.

I think Siddhis are wonderful way to show that you are truly on a
powerful path and I am glad that my colleagues in this system have them.
But at the same time, I think the mission of this group is a great and
useful one.

And dont forget the last thing Zui said: this path is one of
surrender, not will. We are turning this body over to higher powers for
it to use as it sees fit.