I've had a March F 3-24 and March FX 5-40 for over a year. The 5-40 sits on my MRAD 338LM and have shot over 1000 rds with no issues. Glass is great and other advantages include size and weight, low turrets with crisp clicks, easy (no tool) zero stop, repeatability and I believe 28mil elevation in 34mm tube. The 3-24 has all the same features in a 30mm tube. Great for distance in 20 or 30 MOA mount. Negatives are high cost of illuminated versions, but total package cheaper than most other premium scopes. Paralex adjustment can be difficult! Eye box can also be tight on maximum power. 0.05mil clicks (5-40) can be confusing when all my other scopes, including the 3-24 have 0.1mil clicks. Both will focus down below 10 yds! Mirage can be fierce above 20X, but higher magnification helps my crappy 65 year old eyes and I don't need to lug around a spotting scope. Kelbly has said many times, he will honor the March 5 year warranty long as long as you own the scope, surpassing the Deon warranty limit.
Just got a new Vortex Razor HD 5-20X with EBR-2B reticle and love it. Everything I need in a scope plus illumination for about $2000. 35mm tube limits your mount choices, but works fine on my DTA SRS in Sphur mount. Lifetime, no fault, transferrable warranty. You can run over it your truck and get it replaced.
I also like S&B, but only with DT turrets and old technology without significant updates. The company seems to be relying on their reputation rather than innovation!
Have a Nightforce BEAST on order and hope I'm not disappointed, but I'm sure it will sell easily, if I don't like it.
Have heard great things about Steiner, Kahles and Premier, but have no experience with any of these.
Good Luck and Good Shooting with whatever you choose. You just won't know if it's for you until you get something and try it!