This past April I purchased a GeoSatpro SL1 PLL LNB from Dr Sat. I was eager to compare it against the 3 Avenger PLL 321S-2 lnbs and an Invacom QPH-031 circular/linear lnb.
Well the SL1 did not seem to perform well. During blind scans it missed TPs that the Avenger pulled in.
Finally this past week I took it back to Dr Sat's Oakville store.
Well no problem. It was replaced with a new one free of charge, no hassles.
Its now residing on my 25" dish fixed on Hispasat 30W. It scanned in all the TPs. It is working the way it should.