"Bombard Commando C4 4.30 Metre Inflatable
The Commando is the emblematic boat of the Bombard range. It is an adventurer with a solid reputation among explorers. It has a solid and resistant aluminium floor, as well as a rigid keel which provides excellent seaworthiness.
The commando range can be folded away into carry bags and is ideally suited for diving, fishing or just leisure cruising.
The Commando range has a monobloc floorboard system. It is made from anodised aluminium, is rust and rot proof, handles shock with ease and has a built in track for attaching accessories and equipment."
Yes it dose have a ridged keel & having a Bombard Airotec my self I would think it is worth the extra money if you can afford it!