Well naturally I build one of these, I designed and manufacture it.  ;-)
It's a 6" compatible frame designed specifically for racing.  In the name, the X is for X config, as it is a perfect X.  The R is for Racing.  The 260 is for the 260mm measured diagonally from motor to motor.
The arms are made from 4mm thick very high quality 3K matte twill weave carbon fiber, and are 12mm wide at the thinnest part.  Perfectly suited for FVT Littlebee 20a ESCs.
All of the plates are 2mm thick, same quality carbon fiber for top and bottom, and the middle plate is a PDB.
The PDB handles 3-6S batteries and provides not only regulated 12v and 5v pads both front and rear, but all of those outputs are filtered as well, both to provide for clear video and to help protect electronics from voltage spikes (which have been found to be common with the Littlebees.  This PDB will save your electronics from that, so even if you don't need regulated power, you should use it.


The frame is pretty light, although I forgot to weight this one before building.  The 5" version, which only has just slightly shorter arms, weighs 127g.  All of the screws are aluminum alloy, and most of the spacers are as well, a few in the FC stack are nylon.  It also comes with a fairly lightweight foam lipo pad that is sort of gel-like, where you can't mash it down completely and it allows for a little movement (to try and absorb some of the impact), but won't slide easily.
The 5" built with light 2204 2300kv motors, ready to fly except lipo (308g):

The 6" ready to fly except lipos - but with hefty 35g (ea) 2306 2100kv motors and triblades (364g):

With my usual 1500mah 4S 60C lipo, it's 527g, and with my 1800mah 4S 60C , 566g.  You can add the weight of a gopro or whatever if you like, I almost never fly with them.
And here's a few glamour shots.  LOL  




Motors:  RCTimer/BeeRotor FPV Racing Series 2306 2100kv
ESCs:  DYS XM20a with latest blheli, DL enabled.
FC:  Tornado F3 from Moto Moto / Impulse RC
RX:  X4R-SB (SBUS)
Cam:  HS1177
vTX:  Foxeer 25mW 40ch (with raceband)
Props:  I think these are HQ 6045x3  I usually use HQ5045BN or KingKong 5045BN
LiPos:  Ones from these photos are from Vigor Power.  I mostly use those and the 75C ones from Leopard Power.
More info: https://www.facebook.com/BULLITDrones/
For sale soon at: http://BULLITDrones.com

LOL, I'm here...

Interesting looking frame.

Couple of things.

ESC Pads on PDB for +, - , sig and gnd, how does the sig and gnd end up connecting to the FC

Esc to Motor wires wrapped around the arms to go underneath... I have done that once on a build and eventually killed an esc through chaffing or an impact on the arm which cut the wires.

Battery is at prop level while good for COG it does beg the question..How likely in the event of a crash will the lipo suffer prop damage?
Lipo balance lead needs to be tucked (secured) so not to hit the props.

Vtx looks exposed and vtx antenna looks like in a decent crash will also get chopped by a prop.

RX antenna looks way to loose and may result in a prop strike as well.

And for most of us we would use a HD cam of sorts and with that sized lipo no way can we use a Gopro or similar. Solution?

And your esc's do not appear to be heat shrinked at all..was this for a reason? as they can cop a fair amount of damage slung underneath, not to mention any possible contact with the carbon frame.

But, like I said, looks interesting, my biggest concern of all is Lipo being struck by props and the Lipo balance lead and main feed power cables being struck also.