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I would save your money and get the offical Sony Remote, Region X and the Scart lead from SR. May cost £50 but its all top rated stuff no cheap stuff here. The Sony remote is the only remote to get. Region X plays RCE movies, which the DVD enhancer may not do. And the scart lead is Gold Plated and would be of much better quality than in the DVD enhancer package.
Do the smart thing and spend the £50 for the top quality bits.
If so, then no, it's not worth it. I read a review in the official PlayStation Magazine, and it's literally no different to turning up the brightness on your TV.