Yeah I am not too concerned.  As a whole, the frame seems solid and strong.  One of my teammates had a Trek Boone that you could press the middle of the top tube and it would flex.  I think it is the nature of a wide tube diameter and a thin wall. 

I received frame yesterday, and am happy to report that some of the issues posted here the past few weeks were not a problem for me. 

Clear coat over a really great chameleon paint

Faced brake mounts

Fit of everything seems really great

I requested both round and oval seat clamps and both were provided, showing attention to detail

Will post pictures when its complete

I ordered back in December.  Its ship date has been pushed back 2 times now.   I hope they are planning on building some stock, because waiting this long is brutal.

I went ahead and pulled the trigger on this frame after reading this thread.  Communicated with Wendy, and she was very helpful in making some selections with regards to paint, handlebars, and options.   

However, the lead time is quite long.  I wasn't expecting shipping immediately, but she referenced a new mold being made, and shipping isn't estimated until March or end of March.  I ordered end of December.  Just a heads up to anyone considering.

I agree it is frustrating.   For what its worth,  the yxbikes ebay store offers the frame with axles and headset all together at the lowest price.

While you are at it, I would buy a spare hanger from the flyxii official store accessories.

https://www.aliexpress.com/store/1100498203/pages/all-items.html?productGroupId=211587112&spm=a2g0o.store_pc_home.smartGrouping_645504537.211587112&storeId=1100498203&sortType=bestmatch_sort&SearchText=&filterType=

I will post some pictures later but I have been meaning to share my experience with my cx build. 

Cyclocross is my primary discipline, and for this year I wanted a pit bike. I too wanted the true CX geometry with short wheelbase and high bottom bracket.  I landed on the GR029/FE-806/CX028  frame.  I put on SRAM force because that is what I like and I race single speed with the zip tied shifter.  I purchased through ebay store https://www.ebay.com/usr/yxbikes.  It included headset and thru axles (although the fork doesn't have a threaded insert, so it uses a quick release style thru axle), which added a level of simplicity.  It came with the flyxii top cap.   The crown race was a pretty snug fit, and required a pvc pipe to push it into place (https://nuxx.net/blog/2014/02/09/pvc-1-5-crown-race-setter/). 

The geometry is a bit funky.  I really wanted to get the stack down to a certain size.  This frame has a high stack and short reach.  So a compromise was required to get  the stack where I wanted.  I sized down, thinking I could run a bit longer stem.   This worked, but I will say, it puts your pressure vector on the front tire in a less desirable angle while cornering off camber.  I have since put back on  a shorter stem.

The build went very smoothly as it uses those clip in cable stops.  BB shell threads don't look pretty but they were fine.   I paired this with a set of 40mm superteams with onirii rotors (CD-02), which aren't great and have a slight creak to them, but serve the purpose just fine.  Other items include, Ryet 3D saddle, Uno 100mm stem, RXL SL 38mm, Elita One 27.2x350mm seatpost, and Bolany 11-36 cassette.  Basically a full chiner build with Sram Force.   

Total Weight came in with pedals and bottle cages just under 18 lbs.   

When the season rolled around, I raced it instead of my A bike, and I love it.   The bike rips corners and having a true CX geometry and sizing down a bit has worked really well for me.  I'd highly recommend this frame if you are racing CX but just be aware of the stack/reach combo.  I much prefer it over longer gravely type frames being used in cx.   

Not aero but are 38cm. I am running them on my cx bike. 

https://www.aliexpress.us/item/3256803645579573.html?spm=a2g0o.order_list.order_list_main.85.44191802T4jATG&gatewayAdapt=glo2usa

100 miles on my GR9 set and its...ok. Braking is great. I accidentally did the "squeeze without wheel" thing mentioned above totally on accident when removing my bike from the car rack. Now my front brake grabs really well lol!

Shifting is ok. Shifts to harder gears nicely, but is struggling to move to bigger cogs. I think the cable is stock shifter cable fully stretched now and some fine tuning on the indexing will make it much better. I'm wondering if upgrading the cable will improve performance.

Still getting used to the ergonomics of the ltwoo hoods. Might just be my fit that needs some slight adjustments.

Did the replacement shifter work much better than the first?   I just installed my shifters and am having similar bad shifting.