As far as I am aware the bonus funds are for the download casino only and therefore only valid on the Microgaming slots and games rather than the other providers offered in the instant play browser casino. That's okay with me but I think there could be a great many disappointed players who don't realize this complaining to support!
Bonus terms are a little frustrating for lower depositors as there is a maximum limit per spin of £5 of 10% of the bonus amount, but strangely it is the LOWER of these two figures which applies - it's usually the larger figure, and I think Prime could really do with adjusting this as people who deposit just £10 for example will be stuck with a limit of £1 per spin no matter how large their balance becomes. Granted, that might not happen often!
Bonus wagering is definitely reasonable though at 30x the bonus amount. That's probably the lowest around for a Microgaming welcome bonus actually and makes this well worth taking if you are yet to sign up at Prime Casino. Most other casinos have increased their wagering requirements drastically since the time I signed up so it's nice to find one that has not!
Checking the terms and conditions for the bonus I found they read extremely familiar and upon checking it seems a large amount of these terms were borrowed from another casino. I won't name them here but it seems Prime have been quite naughty here as they definitely are not part of the same casino group as far as I can tell!
Nevertheless, I had no trouble getting paid when I played here and this is probably the best bonus you will find for a Microgaming download casino, so it's got to be worth taking.