Mr C,
Re DESO, I know the minimums are 1000 total, but to give you an idea, i have just been invited for a DESO interview and have about 3000 hours, about 2000 turboprop hours and am currently flying PIC on a multi-crew light Jet above 12500lbs.
Is the 300hrs person comaprable to the 3000hr person? At that point-NO.
There is significant difference in experience between 3000Hrs and a cadet. All types of flying with probably 3-5000 approaches and landings compared to a Cadet, but to be honest I don't know how that actually counts in terms of being upgraded in CX!