How is the Magic V 50k?

[Spectral]

I will be getting a V9 silver PS2 with a mod chip. The place I'm getting it from only do Magic V5 50k and smart chip after having problems with others. Which of these 2 is best? I'm only interested in reliably booting PS2 and PSone imports and backups. I'm not bothered about fast boot,etc. Do any of these chips have any problems with copy protections? I'm leaning towards the Magic V 50k has they have units ready to ship, where as the smart chips are on order. Any reasons I shouldn't go for a magic V 50k?

Thanks in advance