Don't really see what there is to talk about here, buy, try, return if it doesn't make a difference that you can justify.
Simple, the companies doing this would be out of business in two minutes if it was a load of tosh....Fact.
Burn in works on the electron level, it is an established fact with the major manufactures (Elna, Sanyo, Auden, Rel, Vishay (to name a few) who have done development research and advise on burn in periods.
i.e Sanyo Os-Con SG Solid Electrolyte Series... "it is recommended that the OS-CON has over 200 hours to burn in to reach it's full potential"
And they are correct, as I have found out by doing so myself over many years!
I can also confirm the same improvements on cable burn in. Don't be ready to dismiss things until you have acquired an in depth, detailed knowledge. It is best to keep an open mind otherwise it hinders the learning process. IMHO
Samsung LE46M86, Onkyo 875, Sony PS3,RDR970,BDP-S350, Modded MA RS8,RSW12,RSLCR,RSFX. Soundstyle WG3AV, QED SA XT/Kimber4TC,Classic Powerkords, Audioquest Quartz interconnects, Mains:-shielded spur. BT MTU's, Bi-amped fronts /bi cabled fronts,centre.