The HHA 5000 also has a machined aluminum appeture,where the Cosmic is lexan.Both sites have very bright pins,I just like the way the HHA is made.Make sure that if you buy the HHA you get the new model,the old ones had the site level under the site housing and it is hard to see when you draw.The new ones have the level inside the site,in frount of the pin.If you have a older 5000,call Arlene at HHA,and she will send you a new one at no charge-they did that for me