If your main objective is to make a low deposit and get as much in promo funds as you can then these are obviously the best offers.
The suitability of these deals depends on how you like to play. £10) with matched bonuses often in the £50 region. Most of these promotions are restricted to low deposit amounts (e.g. Generally 500%+ deals are only run by the bigger companies, who have the resources to be able to afford them. The online casino market is one of the most competitive industries in the world and consequently some brands will offer deals that match deposits by 500% or more to try and get you to play with them.