May be a convtroversial view, but i am going to miss the 458, especially in the original 458/0 - guise (and the 460 in its pre conversion). I am aware the 458/0 were initially a very troubled train, though Wimbledon certain did their magic on them. Prior to 2009 I didnt live on the SWT/SWR network (except for a short period between 2004/2005, where I lived in Fareham), and had no contact with the 458s, and whenever I did use the SWT it was mainly the 450/444 which I found very nice. When i moved to feltham in 2009, I was slap bang in SWT, and specifically 458/0 territory. Initially cautious based on what I read about them, I quickly became to like them on the fast runs from feltham to Waterloo, as well as the odd occasional trip to Reading. There was somethign very comfortable about them when riding them which I could never fully pinpoint, but definately felt there. The conversion to 458/5 apart the looks, just didnt feel the same in comfort, especially when the conversions started running the Reading route, they didnt feel as composed at speed, especially on the stretch between Putney and Richmond. Also I felt the reliability did take a noticable drop with frequent Air Con failures, cleanliness issues and breakdowns. Whilst the 458/4 were a slight improvement on the 458/5, it never got back to the original /0 feel.
Again, I think my view may be a minority, but i will miss the memories of riding the 458/0 from waterloo to Feltham, and the occasional trips to Reading on them