Digital BW, The Print

Hi all,
I am based in the UK and and have a question regarding which ink 
sets are best for my Epson 1290S.
I thought I was getting very respectable mono results using Epson 
colour inks but was advised that printing in black only was better.
Having tried it and I love the rich black but find the dot pattern 
intrusive.
Does anyone have experiance of independant B&W inksets? and how do 
they compare.
I have looked at PiezographyBW system but am initially put off by 
the thought of having to order from the US.
My questions are:
1 Is PiezographyBW as good as they claim?
2 Does anyone in the UK use PiezographyBW? and if so how are 
deliveries?
3 What other systems should I look at?
Thanks
Richard