Got to say I jumped on one in January of this year (2016) and was with me in around 5 days (Korea-to-Thailand - where i am currently living). Minimal duties to pay (which surprised me) I think due to the fact that it's not a TV or with a TV tuner. Anyway once it arrived it was perfect out of the box. I went for the AMH A409U V2 a 40" 4K monitor with ultra slim bezel and a breeze to set-up. Followed up with a profiling using the ColorMunki Photo which has left it looking pretty damn good.
There is an element of pixel risk here with these panels (and why they are so reasonable) but I also think if you start to look around at available options from big name manufacturers and retailers there are more 32"-and-up sized 4K panels around now. So you have have to do the sums and see if it's worth it all (they do not charge for shipping anywhere in the world usually, which is a bonus).
So for those no necessarily going for the full 4K experience just yet and want a better scan rate then these various sellers have a mixed range to include Full HD, 1440, 1600 and of course the UHD/4K options (usually through dream-seller, gnstore, gn_australia, green-sum to name a few on ebay). The brands are AMH, Crossover, Microboard, Quix, Wasabi Mango, Yamakasi, AlphaScan etc. and will often ship with either Samsung, Dell or LG original panels in various formats (TN/MVA/IPS) and clearly worth a look around. They do come with a warranty and they will return monies as necessary and can be largely trusted as good retailers/sellers.
I had a relocation issue with my purchase as I have an ebay account in UK and am living here but they (Dream-seller in my case) worked around the ebay/paypal issues to make it happen. So far my experience has been good.
So originally when i plugged it in i was running the following set-up:
Asus P8-Z77-V LX MB
Intel i7-3770k
Geil 1600Mhz DDR3 4 x 4GB
Sapphire 7850 2GB OC
Raidmax 700AC PSU
and the three monitors for work.
Namely:
AMH A409U 40" - 3840x2160 @60Hz (DP)
Dell WFP 3008 30" - 2560x1600 @60Hz (HDMI)
Eizo ColorEdge CE240W 24" - 1920x1200 @60Hz (DVI)
Then changed the Graphics card to a AMD FirePro W4100 and continued to enjoy the same resolutions as above but am hoping to exchange my odd sized monitors for another 2 32" 4k panels - which the card will allow me to run the 3 x 4k monitors at 60Hz.
I have been lucky but so have a lot of other users and forum members (see TekSyndicate for other experiences).