Strictly one man's perspective (and
possibly one woman's), I see what I'm now calling "topper mods" as basically interchangeable. The differences between one and another are no longer enough to carry me all the way to purchase. Even the new IPV2D{ZXVRQ} (or whatever it's called) is coming up short for me.
Difference makers, again - just for ME, would be things like the Billet Box, Railbox, XvoStick, etc.. Mods where the issue of space comes into play, changing what we once knew as gospel (atty on top, battery on bottom). I believe these are the mods of the future, with topper-mods slowly falling off the charts.
I love my Cool Fire 4. It's awesome. But I truly think it's he last of that type for me. And it might become obsolete (for me) in about 4-6 weeks. We'll see.
And since I'm only one buyer, I guess it really doesn't matter much now, does it?