Hi zobsky! 
Thanks for your very informative answer! I was wondering, except for the noise issue, do you notice any difference in sound quality to the permanent XO you make afterwards? Would you say the Behringer is good enough for permanent use?
Thanks!
Johan 
I can't give you an apples-to-apples comparison as I would've had to build a 4th order passive (much $$$).
That said, the behringer certainly didn't sound worse than my passive crossovers.
FWIW, I did hear the marchand x-over in a triamped system. The system sounded good,but I couldn't make any judgement about the crossover itself.
Re. permanent use,
1. the turn on/turn off pop always bothered me (especially on more efficient speakers), but it's easy to get around if you turn on the amplifiers last and/or use a protection capacitor on the tweeter. I suppose I could solder a cap across the on-off switch to suppress this pop, but I never bothered.
2. as I mentioned, the pots and switches on mine got noisy and less responsive over time. I suppose it could be lack of use, but it still doesn't give me a good feeling. I did manage to restore them though.
Behringer hasn't got the best reputation for reliability, but this piece has worked fine for me at a low cost. I suggest you try it if you don't intend to subject it to heavy torture. You could always return it if it doesn't work for you. The main advantage of this crossover vs. the F1 etc is the flexibility in chosing crossover point & phase,but it doesn't look as solidly built.
There are several other better built pro-crossovers (eg rane) if you want to upgrade later on. I've got my eye on some of the digital ones but can't justify the expense at this time.
