The signals are no more unreliable than comparable indicators such as stochasticsi don't find,but does give incorrect signals more frequently if filters are not used.
Personally i will only enter the trade if it is backed up by my other filters,this can mean a lot of chart watching,but when using the 1 minute charts opportunities are presented more frequently.
I don't think trading off 1 minute charts will make you a fortune,and it is extemely discretionary, but it provides a lower risk strategy,with the possibility of catching longer trends if you feel the trend on the 5 minute charts warrants suffering the few points pull back when the stochastics temporarily reverse.
With regards to risk as each trade has set parameters it is clear when you have entered a trade wrongly and losses can be kept under 10 pips. If you have a £10000 account that means you can stake £10 per point safely knowing you will never risk more than 1% of your account.
I have found the risk/reward ratio for this type of short time frame trading varies greatly dependant on how tight you keep stop losses and how well you can recognise when to exit.I would recommend several weeks of following one or two instruments intraday on 1 minute 5minute 15 minute and 60minute, starting at 60 minutes to see long term trends and working your way in to the 1 minute chart, when all the trends match up your probability of success is increased greatly.Try to avoid trading against the trend anything further than the 10 minute chart,fighting the trend before the 10 minute charts never usually yields a large gain, eg, if 60,15,and10 minutes are downtrending and you are planning to ride a long based on the 1 and 5 minutes charts there is less chance that you will make a trade that would fulfill a decent risk/reward ratio.
Sorry if i've bumbled on a little
Hope some of this is of interest to someone.
Ps. i'm using cms not cmc,typing error
Nathan