A while back I bought a couple of Nikon series E lenses, 28mm f2.8 and 35mm f2.5.
I bought these just out of interest as they're small and I got them relatively cheap. I did read on one famous bloggers site that the 28mm is awful and the worst prime Nikon ever made and that got me interested as sometimes "poor" lenses can maybe be rather interesting so I thought I'd give one a go and I have to disagree with that famous blogger as I find it to be a perfectly useable lens. Good even. Maybe that bad review was down to sample variation? But after saying that I have to say that I can't say that I've read a good review of this lens but maybe I just got lucky or perhaps I'm not that picky. I got the MK2 version which is IMO better looking than the MK1.
The 35mm f2.5 has a bit of a fault as it sometimes squeaks when moving the focus ring. It only does it in one direction and only when pointing downwards. I never complained as I got the lens cheap and maybe the seller knew there was a problem and therefore pitched the price low (but you should always declare a problem, IMO.) I think a clean and lubrication might sort this out but as it's a cheap lens I haven't bothered but I checked the "Sold" listings on evil bay today and saw what these lenses are selling for and they're going for a lot more than I paid so I think I will invest in a service
A few 28mm series E pictures.
I'm definitely going to send that 35mm f2.5 for a service soon