I agree about the "reading between the lines" comment above. Most of Martin Colloms' reviews had to be read that way - by the things NOT said...
The existence of sites like this one must hopefully help in gear choice as we're not all valve and Tannoy owners (nor are we all Techie owners - hang on a minute, I am [SL-150].
I'll try and give the best help I can from my memories and experience, although I can't remember the details of Andre's Mayware post above, despite selling and setting up more Formula 4's than I care to remember (why do they fetch such silly money today, as there aren't many super high-compliance carts about these days?).
I can't go on and I can't go back, I don't feel so matter of fact,
I tried and tried to make good sense, What's the good to try it all again?