For CR123A fans the Surefire T1A is available with aluminum construction. The Quark 123 is TINY! Great light. Wish I'd drop the thing to check build quality! Just kidding. Mine is Ti construction and other than getting extremely warm on high, it works great. My EZ CR123 also gets VERY warm on high. CR2's are even smaller but have none to compare. My beef with CR2 lights is "usable size". If clicky switched, I wouldn't be able to operate the Quark 123. Hands too big. YMMV.