We've been extremely happy with ReadyTalk. We do a webinar every 4-6 weeks, with attendance ranging from 200 - 1,000 people We've used them for 3 years and literally never had a problem.. I use the Marketo connector and it all works great to keep track of who registered, attended or no-shows. I have attended plenty of webinars and meetings using GTM and Webex and have often had technical issues, and my sales reps (who use GTM) have had problems when they do sales demos. I strongly recommend you consider ReadyTalk. Feel free to email if you'd like more details or a contact at ReadyTalk. alisagoldschmidt@confio.com