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I rely on a bolus adviser too Gill - i still have my old Expert, and would continue to use it (or the mySugr app) if I went back to MDI long term. But I use the bolus adviser on my pump, and find it really helps.
The benefit for me is that I can make smaller adjustments as my insulin needs change through the year, and don't have to stick to 1:10 to keep the maths easy. I can go 1:9 or 1:11 to adjust up or down by 10% (ish) rather than making bigger changes or just winging it