Maxflow filter for 661, is it that good?

[WeirWolf]

Any long-term users of maxflow on 661's? I'd like to hear what ya have to say. Only reason why I haven't bought one yet is because I think that they look ugly and of poor quality.
Are they actually better than stock?

 

[huskihl]

No comparison to stock. They seal and filter better than the original HD2