I think that except of the quality of ink there are other factors that
matters, especially the support, the know-how and a friendly attitude. And
Mike in Inkjetsaver do good job. I bought some items from him, but I've
never used its inks, I suppose has quality inks too.
On the other hand, I suggest not to ask such things, because refill items
are cheap, just try something. Each one would has its opinion.