Review on Ronsit Replacement Brush Heads: Find the Perfect Fit for Your Electric Toothbrush - Compatible with Professional Care SmartSeries, TriZone, Advance Power, and More (8-Pack) by Jessica Russell

I originally ordered 4 packs of these brush heads for my Oral-B Pro 1000. They arrived quickly, were very reasonably priced and did a good job. So I repeated the order and this time ordered 8 packs. I didn't need them when they arrived as I still had the tips from my last order. You know when I opened them a few days ago they didn't fit! This is clearly a different product now and while it still lists compatibility with Oral-B Pro 1000, the last 8 pack I received had the wrong internal shape and didn't fit my toothbrush. Looking at them side by side, you could clearly see that the inner body of the toothbrush head had a different shape. There appear to be serious quality control or labeling issues.