depends
who you talk to. I have a tippy without, and accuracy is a big problem, I have bought a Lapco Bigshot (voted by most as the barrel to get) and I still have problems. I am going to get a flatline for mine, as I am getting a Shocker as my primary marker, but I still want to use the tippy as a 'long range' marker' (i.e sniping)
A friend at the site has a Flatline, and - if setup correctly - it does not break paint, and is far more accurate for distances over the usual marker range, ie the ball "floats" for the first 100 yards or so, then starts its drop, unlike a normal marker which starts its drop at the barrel end.
Basically for short range work (i.e Tournys and woodland enclosed rec ball) no
If you are playing mainly open rec ball, then yes, thay can be good fun, and as I have found out, very good at long range.
As I am converting my Tippy into a paint rifle soon, I may have some bits that you can buy cheap, I will see how it goes.