The CellLog 8 not only monitors charging and discharging, sounding an alarm if your discharging too low or the batteries are being overcharged, but it gives you detailed information regarding the state of the battery in operation when you download data to your computer (using LogView software). It's much more capable of protecting your investment in LIFEPO4 (let's face it, no battery will give you anywhere close to advertised charge cycles if you don't take adequate care not to discharge it too deeply or overcharge it). Here's a sample of the data you get in graph form about individual cell performance. You just don't get this kind of data from the monitors you are looking at. With the CellLog 8, I think it's safe to operate without a BMS.