I can totally vouch for the 'Streamlined' , haven't has a chance do a review, but seeing you asked....
So light I seriously thought it was toy!...until I smacked a reef at full tilt,

bomb proof, and stiff as , amazing piece of kit, hard core engineered...not everyone will love the 'different' way the boom clamps on, it is a bit fiddlier, could be crappy in cold weather and cold hands...(not something I have to deal with!)

Its very slim, fat at the head end, has no clew stuff so to speak, maybe not suited to big bellied race sails? From what I can see NA in Big sizes yet... I christened mine at Green island so got a big work out...so early days still...Also lashed out on the Streamlined Carbon Extension and deck plate etc...again has a few 'different' things to normal, bit more metal than most, so needs a bit of regular TLC, it's super over engineered, super light.
I still look at the boom and pick it up in utter disbelief! hits the scales at about 2kg!.. 2100gm ish or so....I'd love it more if it was V grip, not sure if there are any Vgrip carbon booms? Vgrip IMO is way better for ergonomics, blisters etc...
I raved about a brand of V grip booms about this time 12 months ago and ended up with egg on face, as I turned them both into spaghetti! So hopefully this investment upgrade makes that pain go away!

Main downside currently is limited sizes, (about a 7ish sail at 210cm max) if they can get a bigger boom sorted I would imagine they would increase sales to a wider market.
Really worth a look and available at Surf Sail WA,
http://streamlined.us/Booms.html