I watched most of the intel committee, they could have done it in 2 hours, instead of days.
Watched the Judicial committee proceedings, which was basically 4 professors with no direct knowledge of any event testifying; and that was it for the committee.
I have seen better performances in a Soviet show trial.
The key issues are: Did Trump withhold money in exchange for a investigation of Biden's son and was that in line with US stated policy on corruption. There is enough there for both sides that support their position.
Is the President's refusal to let executive branch officials and documents appear before the committee impeachable? The law professors basically said that Congress does not need a reason to impeach a president. The reality is that in order to get public support, they should have gone to the courts to get a ruling, that would give legitimacy to their position and if Trump refused after the courts ruled he has to turn over documents and let executive branch official testify, then impeach him. If Trump refused that, I would support impeachment; as it stands now, it is obviously a political show trial.
BTW letting the Democrats lawyer question the witnesses and then testifying was a new one; fortunately for them, the news media didn't cover it and the public is generally unaware of that particular farce.