I used to have a similar piece, inline, to 6-arm, to 6-arm.
Exact same shape, there was just 2 trees instead of the 1 there.
I liked it while I had it, but the inline was open ended and down facing, so it didn't really fire.
I ended up selling it to another member, who managed to break it within a few months, so I'm not so sure how good the durability is on them...
I liked it at the time, but wouldn't buy one again
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So a mate of mine just made some oil for the first time, an he knew I had some oil gear etc, so he asked me to show him how dabbing worked.
I took round one of the adapter sets that comes with the D-020 line, and told him he could just have them (male male adapter, dome & glass nail) since I already had better gear for my own use.
He didn't want it for free though and have me an actual RooR carbon filter (worth about $60 or something)
I told him the adapters were worth all of $5 an he could just have em, but he insisted on trading
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After playing with my D-020 &-W, I've decided I'm never really gonna use them (I kinda knew that when I ordered them) so they have now been placed on indefinite loan to a few buddies for combustion purposes.
Seeing the excitement on their faces that there's finally a piece in my collection they can smoke through was more than worth the price of them