Nothing is special about these lights! If we think about it they are very similar to the Fenix TK15 and TK22. The Fenix TK15 has been around for nearly 3 years now!
They probably going to be a little cheaper and have a couple of new features such as low battery warning, voltage reading, memory mode on strobe, and a side switch that is probably easier to find - and which hopefully won't melt too easily!
They do have a 3-minute step-down (the Fenix have 30 and 20 minutes respectively) and a cheap clip. People looking for a flashlight in this category might be interested in these models and the new features they offer!
The TK's max is lower than what the P16 would step down TO though, for example, so its not apples and apples exactly.
After a while, its hard to make a flashlight that doesn't look or work like other flashlights, and still have people recognize them as flashlights/know how to use them, etc.
Lights like the Spy with the cells in a barrel next to the lens barrel, the HF's with the rotary tail cap controls, etc...can make a feature that works and makes sense, etc....but if you need a tactical light....the switch has to go on the side...and side switches have been around since the 1890's or so...as that's where MOST people instinctively hold a light and find it convenient, etc.
After that...how many ways ARE there to be different in a meaningful way?
The progress is incremental, and, they are definitely trying at least to make improvements...but, its obviously a slow slog.
Colors seem to be a good way to go for some...as long as the switch glows to indicate the charge...it can have a rainbow spectrum to tell you the levels w/o having to count blinks....or an OLEAD screen, a la TM26, as the switch, etc.
So, they're all essentially just tubes with cells in them and light comes out the front...after that, the changes are incremental.