I already posted my thoughts here:
http://forum.square-enix.com/ffxi/th...-changes/page2

Well it will depend on the values. If a lot of them follow the trend of of tier 1 and 2, a lot of tier 3s are totally under whelming since they are static + x acc/r acc / macc/mab , will be complete blah unless they either 1) break the pattern (instead of adding just +5, they add +20 etc) or 2) they convert to a %

EG
Tension Spring III: 3/6/9/12 ->6/9/12/15-> 9/12/15/18%
Since this is % based, a 3% minimum increase in atk is very welcome

Stabilizer III: 5/10/15/20 -> 10/15/20/25-> 15/20/25/30
A +5 bonus to acc however is way to little.

So either it would need to be
15/30/45/60 (break the pattern)
or
5%/10%/15%/20% (20% acc would be roughly enough to cap acc on relevant exp mobs/delve/high end battles etc)

Also all of this is contigent on the new JP adding +10 elemental capacity for all elements so that we can use the new attachments without losing old combos. EG if tension spring 3 costs so much more that you cant use our regular fire attachments, we are better off still using ts2 instead of 3.