I can't argue with experience mate...
I couldn't agree more..
As ED states I would avoid Ti.
One to watch out for is the differences in material specs from over the pond is very different to the UK. (You guys seem to have your own lingo for everything) stainless steel? What grade? 304, 310 or 314, the higher the number the higher chrome content. Greater heat resistance, wear and resistant to oxidisation.
After turning lens for many years I have made my pens "with precision" using home made bushes for turning between centres as well as for Mandrels.
I personally don't see the need for them and just see it as another "fad" having said that if there is a custom base then jump on the band wagon and make hay while the sun shines Dan.
Whatever your customer base wants then go with it.