@erik_squires +1 on DIY. LXmini and a pair of OB-subs has been very fulfilling in my journey. Related to this has been the introduction to new tools and required learning; 3D printer, CAD software, crossovers, DSP, measurement software (REW), and calibrated mic. All have contributed to satisfaction/achievement/happiness. @oldhvymec mentioned, "progress", and I can relate/resemble that comment (just ask my wife - why I "always have to be doing something").
In addition to measurements, I kept a stable of reference products to compare against my builds. That included; Tekton DI w/FU, ML e-stats, GE Tritons, B&W (speakers) and AQ Mont Blanc w/FU (cables). These references help ensure DIY builds are 'sound', and in some cases have effected configuration decisions in achievement of superior results.