Every advert that you see on television or in newspapers or in your mailbox for an online casino or other online gambling offers what seems to be an incredible casino bonus for registering but how good are they really? Casinos.ie has seen many of these casino bonuses at various online casinos and the answer to the question depends on what you think you will get from the bonus. Most online casino bonuses are what is called deposit matching bonuses which in effect means that the online casino will place an amount of money into your account that matches whatever your first deposit was into your casino account. This is generally a 100% match but it does not need to be and there will always be a maximum amount. You will also sometimes find an online casino advertising a deposit match casino bonus on your second or third deposits but these will generally be less than 100%. It should be noted however that this money is not deposited into your cash account but in something called a casino bonus account or similar; the difference between these two is that the money in your cash account can be withdrawn but the cash in your bonus account cannot until certain criteria have been met. The criteria for most online casinos is what is known as a play through requirement which in effect means that you need to have staked the bonus money a number of times before the cash can be withdrawn which is the chance for the online casino to get the money back before it is paid out. What is more, the online casino may also put restrictions on which casino games are eligible for the staking requirement so for example lower risk casino games such as roulette will often not qualify at all or for a very small percentage. A casino bonus will enable you to play for longer with your first deposit but you may be disappointed if you are looking to withdraw the cash after a quick win.