Bridgeport TNC 145 compared to TNC 151/retrofit

Many thanks to all those who have helped me understand how to get a
Bridgeport onto UK 240v single phase, the depth of knowledge and
professionalisim of this site is a credit to all those who
participate. I have one final question and if this is off topic I
appologise beforehand and please point me in any other direction
that could help. What advantages has a Heidenhein TNC 151 Control
got over a 145 control? The only things I know is the 145 is limited
to 1000 blocks, has no rotation canned cycle, can't be programmed
whilst another program is running and can only hold one program.
All these things may seem very limiting but could still be O.K for
me.

Graham