Do you need a 5pt. restraint on a high chair?

I’m trying to decide between 2 different high chairs/booster seats – the fisher price space saver and the Safety 1st recline and grow seat.

The only real difference I see is that the fisher price one has a 5 pt. restraint and the other one just has the lap restraint. Both chairs got good reviews, but there’s a pretty big difference in price.

Is the better restraint necessary or worth it?

http://www.toysrus.com/product/index.jsp?productId=2508005

http://www.toysrus.com/product/index.jsp?productId=3312379

Does anyone have one of these chairs? Do you like it?

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