I have several Materelli "bobbin holders" that are designed for using the small sewing machine bobbins. I have been using them for about 40 years with no problems at all, having bought them from Eric Leiser when he had a shop near Croton, NY. I'd like to buy a few more that I see are now advertised. My misgiving is that I also see comments that they are not as good as other brands with ceramic tubes. Does anyone have comments on the present Materelli's versus the older ones? Thanks.