I've never had any NBs blow in any of my cars. I run with my lights on all the time. Maybe you had a dodgy batch or some dodgy wiring. The Halfords 50% ones I had in my Clio before went on the same side regularly. I blamed the car TBH !
NBs are great, cheap, and very bright.
We sell them at work and out of all the sets we have sold we know of only 2 sets blowing but they did have big greasy finger prings on the glass which is a no no on the bulbs
Ive got a set in my high beam as i do a lot of country lanes at night and i love them and would recomend them to any one as a upgrade bulb