I've used the Speed everyday since 2/22. Like I mentioned above, I didn't have one of the more stubborn ones. The pen does sometimes hesitate on an upstroke when it starts, or if it has been left nib up for overnight. But once it does, it writes on without issue.
I did need tweek the nib a bit (lifting the tines) to increase flow, but it didn't take long to get it there. It will never be mistaken for a wet writer, but it has performed for me. I wrote many an Incrowrimo letters and postcards with it. I think this is one of those pens where ink pairing matters. The first load in this pen was a Kobe Lapis (Sailor made ink). The second was Diamine Graphite. I think it starts easier with the Diamine ink. The 0.9mm italic nib gives good line variation, and the writing experience does not feel stiff.
In the hand, it won't feel like celluloid or hard rubber, but the plastic does not bother me and I'm really taken with its styling. I don't post, so that was not a deal-breaker for me. The section may bother some, especially if you hold the pen higher and your index finger ends up hitting the nubbin of straw that is the Stipula symbol. My index finger hits the lower part of the section, so it's pretty comfortable for me. I like the convenience of the slip cap.
One slightly annoying thing I noticed was that one has to clean the silver-grooved section very well after inking the pen, or else ink stays in the grooves and dries there.
Over all, I'm enjoying the Speed and it's been a good one to tuck into my pocket. I may eventually think about taking it to a nibmeister at a show, but I don't feel like I absolutely have to to get this pen performing.
Photos to follow.