Cameron Langford at CNS gives a great "blow-by-blow" of the case, where McPeters equates the fee to a poll tax that is discriminatory to the public that can't afford the fee… and essentially equivalent to a literacy test for those that are not computer literate enough to understand how to file document electronically. Those are interesting arguments, however, I did find one statement in the complaint that stood out for a much more practical reason. According to the complaint, LexisNexis charges over twice as much for filing over other e-filing services that serve Texas Courts.
Here's the synopsis of the complaint. It is definitely worth a read.