I've been taken this particular form of iron and from this brand for over a year now. I've never had any stomach cramps or aches post taking them. Equally, I have not suffered with constipation due to Active Iron.
As for OnlinePharmacy, this was my first time using them. Swift delivery. I find they have more variety of medical-oriented products than topical or beauty-related products which many chemists seem to expand to. I'm saying this as a positive for me.