I have IB and sometimes i use too the feed from Webull. This one (Dxfeed) is by far better in speed ; its tick by tick data, and with no symbol limits. Plus have a limited lvl2 data included. I have the 49 usd subscription, which includes aggregated data from all exchanges.
Yesterday no problems at the open.
Overall, very satisfied. At the moment seems even better than Quotemedia Connect, perhaps similar to Iqfeed in speed.