I guess the bonus has technically become slightly more "generous" since my own experience because you now receive ten spins on Starburst as well as the 100% match, but I'd recommend just ignoring that fact - one pound worth of 10p spins on an awful game with a 50x wager requirement and a maximum cashout should you defeat this impossible task of just £20 is pretty much an insult in my view and does far more to turn me off a casino than encourage me to play there.
The match bonus is similarly restrictive, again having a huge 50x wager requirement attached plus a cap on "conversion" too. Deposit £20 and you receive £20 of bonus funds, resulting in £1,000 of required wagering with a limit of just £100 on any withdrawal you can make as a result of it. That's just awful in my view and is sure to have created an enormous number of dissatisfied players over the years. In my case my entire balance was forfeit, and whilst I was credited the bonus a second time to try again I was obviously just not happy with my experience on the whole.
Something else to be aware of, bets are made from your cash balance before the bonus funds, and you only start working away at the wagering requirement when you start making bets using your bonus balance. That's only okay if you are permitted to request a withdrawal of your balance in full should you hit something nice before starting to wager the bonus you have been given, but of course that is not the case here.
It's strange to see such a predatory promotional setup from a huge gaming brand, but somehow these guys have managed to create a whole empire of on-line casinos using similar tactics. The only way to stop guys like this taking the mickey out of us players is to vote with your feet!