You'll find step by step guides for both types of dc07 on here!
Wash the sponge post filter, cage, main hose and the little hose underneath in the machine at 60 with your worst towels/bathmat etc, dry them, good as new!
New post filter and belt/clutch and brushroll will transform it!
I'm playing with an Animal Ball 2 at the minute, and whilst the carpet grooming performance is utterly amazing, both tool holders fall off all the time, it's a DC41 in drag, the blockage port is tricky to remove, it was clogged right through with xmas tree needles, the hose is SOOO heavy in your hand with that massive articulating phallus on the end and it's like pushing a Citroen AX across the floor, then you tilt it over just a fraction too far and WHOMPH, off it veers at a perfect 115 degree angle, taking your wrist with it.
I'd have a DC07 any day!