The new Tikka Plus headlamp has a number of features that are an improvement over the first generation Tikka. There are also a few areas where I prefer the original.
Improvements:
Swivel head, very useful
1 more LED (noticeably brighter)
Better switch (by far) than the original
3 brightness settings and strobe.
Replaceable outer lens (same as original)
Relatively reasonable price
Cons:
Less uniform light than original, harsh blue center of illuminated area. More of a ring effect than original.
Slightly bulkier /heavier.
Appears slightly more susceptible to damage from being stuffed in a pack or pocket during rugged hikes. This really applies only to the swivel head which looks like it may be the weak link in terms of durability.
Great light overall. No problems to date, great battery life.
In addition to being a major outdoor type, I'm also a pilot. I don't fly at night without one of these on just in case I have an electrical failure. The Tikka(s)works so much better than a regular flashlight or filament bulb headlamp. This is why Im so sensitive to illumination quality and bulk, probably a non-issue for most users.