I've used J Hilburn for custom shirts (love them), slacks (were "ok" but took some tweaks after), and sport coats (love the materials selection). Pluses include good materials that they rotate regularly. However I've been less happy w/ the service from my JH rep. She wanted to charge me for an extra set of alterations on a sport coat when the fit wasn't perfect - uh no bitch, I paid a ton of money for a custom coat, you'll adjust it until it's right. Overall though, they've nailed the fit on shirts for me so I typically buy one every other month or so since I lost a bunch of weight to repopulate my closet.
Recently, I needed a suit on short notice for a funeral. Because of the weight loss (hiya keto), none of my old stuff fit. JH couldn't turn one around quick enough and I don't have good luck buying off the rack b/c of my body type (barrel chest, athletic thighs). So I poked around and did Knot Standard. Same basic model as JH, a little more pricey and high end. Probably 10x the selection in terms of materials of JH, and they have a storefront where you go to downtown to get sized and make selection. Very happy with the experience and they turned my suit around in <2 weeks, M2M. That includes an initial sizing and they had their local tailor tweak it over the weekend to get it perfect for me on the next Monday when I needed it and couriered it to my home in Cedar Park to get it to me on time.
Next step is to do a blazer in this, channel my inner Del Conte: