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I got one of those and would only recommend it for liquid only. While the needle has large enough opening for small herb particles the orifice at beginning of needle is to small and clogs often.
I know a few guys who have them and what they say they like about them is that you can get as little or alot of juice where you want it. They seem to speak very highly of it.
On edit: didn't say that very well....can be metered.
gun style looks pretty cool. I bet it works well. Just a tad expensive for me. I have one of those $10 jobbies that works pretty well but I guess I don't use one often.