Question about Bissell Cross Wave

The Cross Wave HF2 Select is a newer, lighter version, with a 0.72-litre clean water tank and a 0.54-litre dirty water tank, while the standard Cross Wave (ref. 17132) has a 0.82-litre clean water tank and a 0.62-litre dirty water tank. The HF2 Select is also lighter and features an improved self-cleaning system.