Arguments for and against bicameral state legislatures?

[Blue3]

All states except for Nebraska have two chambers in their legislatures, the upper house being smaller than the lower house. In light of Reynolds v. Sims (requiring state senate districts to be apportioned to have roughly equal populations), what is the purpose of a state senate? In my personal view, state senates are an outdated body that no longer serve a purpose.

What are your views on state senates? Do they serve a meaningful purpose? Should / will the states abolish them?

I agree.

And it would be nice for some states to experiment with parliamentary democracy too.

[Blue3]

What was the reasoning behind  Reynolds v. Sims, anyways? If it's democratic enough for the federal government, it seems weird that it would be unconstitutional for the state governments. I wonder if it will get overturned.

[Blue3]

Having two chambers allows each one to be elected differently. One chamber can represent individual constituencies while the other can represent the entire state or a larger region. One can be elected using FPTP/IVR and the other with PR or STV. 

But didn't SCOTUS say that was unconstitutional?