They are fine. one drawback is that they only pay out once a week, so withdraw after the cut off time and you have to wait a week to get paid.
In terms of games, their Winaday casino is more modern, the Slotland site having started out as HTML, games with no sound and very basic graphics. Slotland has converted most of the games to Flash (with sound and better graphics). Winaday launched with Flash based games, and has introduced other features seen in other casinos, such as autoplay for some games. Recently, Winaday introduced comp points.
The games are quite interesting, and they CAN be influenced by the strategies employed by the player in order to improve the overall RTP.
I have played there for 8 years (slotland) and 4 years (winaday). I was recently "bonus banned" due to my skill and experience at playing their games. It was done properly, in accordance with the accreditation standards. Withdrawal paid, and then polite email to tell me that I had been delisted from future promotions due to my expertise on the games. Pretty understandable, I am an experienced fruitie player, and their games work like fruities in many respects. Unlike the MGS fruities, they CAN be influenced by player strategies over holds and nudges, even stake changes at the right moments. They even TELL you how to do this on the help pages!!
They are also the ONLY operator to have stood by GoneGambling through both good and bad times, and still offer the most generous perks among all the casinos listed at GoneGambling.
If one is going to play there, one may as well join GoneGambling too - it's worth an extra $165 per month for $700 in deposits, and that's the minimum, more is possible through the various GoneGambling games.
They also seem pretty player friendly. Recently, there was a technical glitch that caused my $700 of deposits to appear at Winaday, but never get taken from my Neteller. Their reaction once the issues were sorted out was "keep it, think of it as a bonus". I asked what would have happened had I won big from this money they never received from Neteller, and they said "we would have congratulated you".