If you have a collection of watches (2 or more) and at least one of them has an automatic mechanical movement, chances are pretty big that – after a few days of not wearing it – you have to correct the time/date when you pick it up again. A watch winder may come in handy. If you search on the various watch forums, you will probably read about the oil in the movement that will thicken after a long period of not wearing. However, this has never been confirmed by a watch maker.
I think a watch winder is just there for your convenience?¢?Ç¨¬¶ if you have an automatic watch with a date, which does not have a quick set (quick set = changing the date by pulling the crown in a certain position and when you turn it, the date will change into the next date), correcting the date can be a time consuming activity. Especially when you are in a hurry. The lucky guys with a watch that has a complication like a moonphase and/or perpetual calendar should get a watch winder anyway, it really prevents you from fiddeling around with your watch during the first two hours of your precious sunday morning.
Watch-Winder.co.uk offers various winders for great value to keep your [other] watch running perfectly. The compact winder I reviewed, is pictured above and is available through their website for only 42.99UKP.