After several months of owning the TLR-1S I can confidently say that this tactical light ROCKS! The fit and finish are excellent; holding up to heavy use in rain, snow (New York winter), heat (Texas summer) and everyday abuse (nearly 1500 rounds of shotgun shells). The 160 lumens (produced by the C4 LED) that the TLR-1S puts out is enough to illuminate most rooms making it perfect for use in a house. The strobe feature is great but it may be difficult to activate under extreme stress. It is something to think about when debating between the TLR-1 and the TLR-1S. I would still purchase the TLR-1S over the TLR-1 but if you are really on a budget the strobe feature for me is not a deal breaker.