I don't have the intestinal fortitude to sit through the whole thing, but from the snippets I've heard so far (including the one where Trump wanted to Order Comey to launch an investigation, but Comey recommended he not do that) the dems might to want to wrap this up before it heads further into "empty vault" territory.
Everything else so far, while it might not be "proper procedure" is a long, long way from impeachable. Far more benign than many things Obama did.