It doesn't much matter to me; what the dial looks like is much more important to me ;-)
Besides, I think there are quite a few solid case backs that are very cool due to the various designs, animals, etc. that are stamped or engraved on them.
Actually to me having a display back is a negative on anything with over 50m WR. One of the reasons I got rid of the same 8500 PO in the post above after a month was I don't understand why you would want a long term dive watch with more points to leak down the road (sapphire and a extra gasket means more service cost every so many years to replace another gasket). The Proplof did not have this issue and I could care less what the movement looks like in a diver. IMO they are putting these on a ridiculous amount of watches. Besides if you actually wearing your watches, your looking at the front not the back. About the only watch I have that I'm indifferent about it having one is my GO Senator Navigator Pano Date, which is the only watch I own that has one. If it wasn't there it would not matter. If I want to see what the movement looks like I have the Watch Time Caliber Guide on my desk.
Only if there is good decoration and finishing on the movement or if its an inhouse manufacture movement. I think its unnecessary on watches that use standard and elaboree grade basic ETA movements and Miyota movements put exhibition casebacks. Its pointless, looks dull and boring, infact it just makes the watch feel cheaper than it would with a nice engraved caseback.
It really depends on the watch and how much effort is put into the case back or movement. Omega has some great case backs on the Seamaster and Speedmasters. One of the reasons I went for a sapphire Speedmaster was to see the gorgeous movement but I'd rather not have to look at the ugly plain Mioyta in a Lum-Tec I owned.
For me it also depends on the movement. If it is a common movement (eta, sellita, miyota, etc.) I would prefer a close case-back.
But a watch with a 'special' movement with for example a story of history, a nice design or particular hand finish. I would like a clear case-back.
I own some watches with a clear case-back. Some I would rather see with a 'normal' case-back.
It's fun! You bought an automatic or handwind for its guts, so you should be able to easily see those guts.
Plus, it's your little secret about the watch. Others will see the watch face, but only you will know what lurks on the backside (unless you allow them to see it).
Agree that boring, plain, or undecorated movements are less fun, and that watches in which you intend to make use of the water resistance (by submerging at any appreciable depth, swimming, or showering) probably shouldn't have them, but all-in-all, I'd rather have it than not.
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