im an opsm girl through and through... i work there now but i also used to buy from only there before as well so im not completely biased.
i like the quality and the better brands and we see a lot of spec savers cust at our store that aren't happy.
just make sure that if you are getting quotes that you get like for like. it is really hard to make quotes though until we know exactly what you need and what is most suitable.
if you want any info or even some idea on costs just pm me.