I wanted Sessions to replace Calendly, Zoom, and Livewebinar, but they're not there yet. At least for the technology I use.

Pros:
The UI is excellent, intuitive, and user-friendly.

Cons:
1) to replace it with my Calendly pro, "Book me" forms MUST have phone numbers (maybe for future SMS reminders or other reasons). For me, it's a mandatory field. Like with Calendly, the international location flag is auto-detected and changeable (if someone is booking from country X and his or her phone number is from country Y).

2) on Calendly, there is an option to reschedule meetings from the meeting itself. I can’t find that on Sessions.
Example of text and links that Calendly is adding inside a meeting note:

Cancellation Policy: text for cancelation policy

Need to make changes to this event?
Cancel: https://calendly.com/cancellations/link
Reschedule: https://calendly.com/reschedulings/link

3) "Book me" page is not aligned with the first day of the week. Mine is Sunday. But the booking page link showing Monday.

4) Outlook add-on is a MUST! I would like to invite people to Sessions as I do with Zoom, Teams, and Meet via Outlook desktop or web.

5) Pabbley Connect - I didn’t find the option to create a webinar participant when using a registration form on my website. I'm getting participant details via webhook to Pabbley and want to update details on several platforms, including creating a new participant.

7) There are many permissions on Office 365. I don't want to upload all contacts.

That's what I found after several hours of using (full stack) of things I believe need immediate fixing and improvements!

I hope to get a support reply with a time frame for fixing it, or I'll probably get a refund.

An email reply from support says they will reply in 48 hours.

They promised chat support, but I can't find it!

I haven't tried it yet.
I see many people complaining about quality.