HEAD LOCKING MECHANISM - Upgrade heads can be locked in place between 0°-180° to avoid flopping around while cleaning. For 45 angles, which is a great angle for scrubbing to avoid head flops ...
If you're looking to bring home a Dyson without breaking the bank, the Dyson V8 is a great option. Read my detailed Dyson V8 Cordless review for my verdict after testing.