Hi!
I've used both newspaper and tp pots, and just a note: make sure to either leave the bottom open (sitting them in a tray until the
roots are good and strong) or remove or unfold the bottom before planting, and in some cases I even slice the side. They do break down in the soil, but generally not fast
enough to get out of the way of the roots that grow. Also, make sure to plant ALL of the paper. If any of it sticks above the surface of the soil, it is wicking moisture away from the roots.
They do get rather soggy and some do fall apart. But certainly no more so than soil blocking, and I love(d) my soil blocker!
http://www.johnnyseeds.com/c-455-soil-block-makers.aspx
I had the 4-block sort. I made the mistake of loaning it out last year. I have done my seed starting without it this year and I miss it! I might just buy a new one, or try some of the diy versions I've seen
online.
They need a rather specific sort of mixture to work well, but once you've got your "recipe" down, it's awesome how my seedlings come though with no pot at all.
-K