The DC33c Allergy Musclehead Parquet has one of the lower suction powers (only 280 Watts) amongst high maximum input power vacuums of this age. Across all the high maximum input power vacuums that came out more than two years ago the suction powers range from 170W to 2,100W.
There are a number of alternative 280W suction power vacuum cleaners currently available that you might want to look at including the Dyson DC19T2 which has better reviews.
If you want a higher suction power then you might want to look at the Dyson DC52 Allergy (290W) which also has a higher rating.
What does "suction power" mean?