I Program/run a 2008 HAAS VF-3 50 Tapper it dose just fine for genral appications. I machine mild steel and Alum and my only gripe is the spindle has some grear chatter at higher RPMs. Out of the 3 or so 50 tapper machines I've ran, I would say this is probably the least rigid of the three(Komo, OKK, Win-tec). However that dose not bother me too much being we were able to to most of the bells and whiltles with the machine (probe, VCQ, TSC), and it is the easiest G&M code I've ran.
However, if Rigidity/performance is the most important to you, I would proably look else where. Don't get me wrong, The VF-3 50 tapper is a good machine and I love running it, but you get what you pay for.