Hi. I got a free UF f-17 through a BLF giveaway and here is a brief description.
(I’m not technically-inclined so I’ll let the pics do the talking)
The F-17 is fairly compact (I have average-sized hands)
Head, body-tube and tailcap
With the head removed, showing the emitter etc.
Closer view of the emitter
Scalloped tailcap allows activation whilst being able to tailstand.
Pronounced hot-spot and rather cool tint. Modes are H-M-L-strobe-sos. Always comes on, on high.
Pretty average for a budget ULTRAFIRE, I would say.
The web-page on Tinydeal is found HERE.
It looks like a nice light. The pill looks solid too, with good fins for heat dissipation on the head, but difficult to tell with the star in place if the pill is solid or open( hollow)in the middle. Maybe a good light for mods. 
Ha! Just a few seconds ahead of me, 264 reviewed this very same light
His pics and description are more detailed than mine, so go have a look
And oh yes… his is up for grabs if you live in the USofA