I have a TiCN coated 3-flute 2" LOC 1/2" diameter GARR that I have been using for roughing and finishing aluminum for years. No idea how many thousands of cut hours are on it. I bought it when I put my old Sharp in may garage and have been swapping it machine to machine since. It was a little picky about chatter until I found the nodes where it is stable. 7000rpm for roughing (0.035"-0.050" stepover, max depth I need, and 0.0035-0.006ipt) and 3800rpm for finishing with around 0.001-0.002" per tooth feed at 0.015-0.025" stepover.
I use GARR 5-flute in steel as well - I've got a1/2" diameter 2.25" LOC unit with a 0.030 radius that is my go-to for deeper bores or taller contours in steel. They also seem to get good tool life and usually I wear them out from helical boring first and they can just be end-sharpened.
For most steel, especially alloy and harder stuff (up to 50HRc or so) I really love the Kyocera SGS V-Carb 5-flutes in 1/2". They just run and run. Haven't had a need to look elsewhere.
I have used MA Ford and Niagara for smaller sizes in steel and aluminum but don't really track tool life with those.
I'm just starting to do production runs with Maritool DLC coated 3-flute end mills in aluminum. So far I love the performance and the prices are quite reasonable.