It's not uncommon for pre-bent cages to fail tech. Recommend writing John with the cage you are looking at. While pre-bent cages save some headaches and cash, they can cause other issues that aren't evident until they are installed.
RCC cages installed correctly do not fail tech. Lemons cannot and should not endorse any company but Pagel, when I bought a cage from him for the first time after 4 RCC cages, admitted Jim confers with him regularly and if a Halo cage can meet your needs...ugh cannot say he approved (but he kinda did) but he was optomistic. Never had an RCC cage have any issues passing tech. We just had a headroom restricted car so wanted a downbar-style and Evil Genius had just done one for the same car.
To the OP, for us the difference in price of a delivered RCC cage and buying our own materials and bending it up 100% ourselves in $75-100 if we make 0 mistakes in bending it. That is 100% worth it for us. If you are West Coast based, ask Pagel if he has time to do one for you...about the same price as RCC. Neither of them are great at meeting their delivery dates, communicating about delays, etc so stay on top of the status with phone calls.