I tried it for a bit and liked it (in fact it's better than the sites where I shop), but what's the use case ? Is it a demo of your skills or you plan to sell it (or maybe just get money from Amazon referrals) ?

The main benefits are that it 1) allows you to price compare and 2) it checks compatibility to you don't make mistakes. Hound-O-Matic is a completely automatic and requires simply a budget / vague filters.