I've always fit myself on my bikes and had good success...at least in the sense of comfortable riding for rides up to 140kms on upright bikes. I've done all my brevets on recumbents and this year [being bent-less] got a new DF rando rig [photo above].
I have been contemplating a pro bike fit because I figure as the distances increase my DIY fit may not give as good a result as a pro fit and also they may give me some extra performance by tweaking my position for better efficiency/power production, etc... Stuff I may not notice at my typical shorter distances, but at 200K+ I may be glad I did.
I found a fitter that has done work with a good local randonneur albeit one who rides very aggressively at the front of the pack on a road bike with a more race oriented position. I'm a bars at or slightly below the saddle guy who is going to be middle to back of the ride in terms of speed.
Having never done this before I'm concerned about having the fitter try and push me towards an uber aggressive position on the bike. I was wondering if folks who are similarly inclined in terms speed/bike position and have had a pro bike fit had any suggestions to communicate the needs of a randonneur vs. someone riding a century on a typical road racing rig which I would imagine is what forms the majority of their business.
The other thing I need to decide is when to arrange the fit? Before my 200K this year so I get the most benefit from it or after so I have some longer distance experience to compare the before and after results of the fit?