Anything I wear I try to buy from my LDS like exposure suits, masks, fins, gloves, hoods, etc because I want to try it on. I won't be one of those people that try something on at a store, then go home and order it online. Other equipment I tend to buy online because my LDS only sells three major brand's products. I could jump from LDS to LDS to see if they have the specific product I want, or I could just save myself the hassle and buy online. After all I do all the research myself and tend to use online reviews a lot in deciding if I want a product. I don't need to 'try on' a regulator in a store. If reviews are good then that's good enough for me (my LDS does not have a pool or anything).
I know 5 people that dive Zeagle equipment (including myself), my LDS does not have a single Zeagle product, although they're an authorized Zeagle retailer. If I wanted to buy Atomic equipment and their prices weren't crazy I'd probably consider buying a regulator there, or a BCD. One thing is that I'm not willing to pay 1.5x markup on things like knives so I will order that stuff online.
I still go into my LDS for things like fills. I brought a new tank in I ordered online the other day and they did the visual, filled it, and slapped on a nitrox sticker no problem. It's not a mom & pop type of dive shop though, maybe if I went into one of those with my new tank and asked for a visual they'd complain about how I didn't buy it from then, and I would take my tank, walk out and take it to another shop. I don't have any reason to be loyal to a dive shop, if they can't survive because people want to buy their stuff online, then I'm sorry their business model is not successful. Someone else will pop up to fill the void when they're gone.