I've been weaving with a Bluster Bay end-fed shuttle (EFS) for close to a year now, and recently bought two AVL EFS's at an estate sale. If I'm doing a one-shuttle weave, I usually use the Bluster Bay. For the most part, I like it and it does what it is supposed to do.
I think I'm winding the pirns correctly, but I still sometimes get sections of the weft that pull more than other sections.
I'm now weaving with a Jaggerspun merino/silk blend for the weft and I've found that when weaving with a yarn like this that is a little sticky, I have to put a lot of tension on the warp for everything to work correctly. I also have quite a bit of tension in the shuttle and when I throw the shuttle, there is sometimes quite a pull on the selvage and I have to remember to release that tension before beating. If I do that, everything seems to be ok. I may get a little more draw in than normal, but I'm not even sure about that.
I have really good selvages even with boat shuttles, but I do still like weaving with EFS's. I don't, however, think they're the cat's meow as some weavers seem to think. With a bit of care, boat shuttles can do just as well.
I haven't tried the AVL's yet because they are quite a bit longer than the Bluster Bay. Next time I have something wider on the loom, I'll give them a whirl.