New poster, long time reader...
Having read through most of this topic during recent weeks and hearing about the various approaches and results, I've decided to try this out for myself.
I have been maintaining on Minoxidil for the last year and a half or so, with no noticeable improvement beyond that. But as I've a reluctance to try finasteride after being put off by potential sides, I figured that I'd give this a go.
I can't really work out whether the choice of device had much effect for a given needle length. At this point I am probably likely to go with Dr Pen, but I'm currently reading up on their Ultima A1, A6 and A7 with a view to deciding which type to buy in the next few days.
Once things are underway, I'll be sure to post some updates as time passes.