I can vouch for my Gitzos, being French that was the obvious choice when I bought my first pro tripod back in 1987 (a Studex series n°3), since they were still made in France at that time. I've series 1 and 2 aluminium as well. The Studex n° 3 is still the tripod I work with, after 25 years of good service, I will finally replace it with a systematic 3 or 4 series. I bought a mountaineer 2 series a few month ago, and the added ease of use convinced me to finally replace my old Studex with a carbon equivalent. I've worked with Linhof and Manfrottos as well, I don't like the lever locking too much but that's a personal preference.
In fact I never had to replace one single part, I have 3 tripods only for different purposes. If you treat it decently, a well chosen Gitzo could be the only tripod you'll ever need.
I use Manfrotto 410 and 405 geared heads for precise levelling, they are very practical to use but don't last forever. In case some wonder, the 405 is IMO very overpriced, and doesn't bring much over the 410, except a few more spirit levels and 60% more weight and bulk. I had Gitzo heads as well, but they did not impress me too much, though the GH5380SQR and GH2780QR don't look bad. The Acratech Ultimate seems quite impressive.
It seems RRS makes good tripods, but bad distribution in Europe and very high prices make IMO, the Gitzos more realistic buys over here.