These blocks act similar to traditional vertical pipe blocks except it no longer checks for your position making it much easier to enter the pipe, this is also very useful for if you want to have pipes that are shorter or longer than 2 tiles wide. (like the jars from Super Mario Bros. 2)
These work fine. I feel like you can combine them into a single block that works both ways, though, since one side should be blocked off by solid tiles, right? That and SA-1 compatibility would be great updates to make, but as it is it works fine.