Regen stats hat actually dont work or is it coz of lag that it seems like u dont regenerate ur health?
They never worked as ND confirmed they are indeed broken but alas they never fixed them but continue to sell them.
X-Ray Meter hats function both in the same manner as PING! and expand the reaches of Come Here and For My Buddy (which can be stacked as well, BTW). However, these hats do not affect PING! itself, nor do they affect variants like Exposed. Let Me See and Gotcha already reach across every map released so far, including Lab Map 11. For reference, PING! has a reach of ~13 meters.
Also for reference, 8 meters is pretty short. To find out how far the Explorer Hat reaches, go into a custom match with Elena's Giraffe Head on (if you have it) and see how far away you can get the weapon icons to pop up. You can also just use the Disguise Glasses (through LAN Party, if nothing else) and use those for a conservative PING! comparison. If you think that sucks, you can imagine how useless the Explorer Hat is (especially with that awful RoF negative).
As for Regen hats, only positive Delay hats don't work correctly; they add to delay instead of subtracting it.