The only disadvantage is over working the amplifier. Your speakers will somewhat ask for 60 watts rms when you turn up the volume. However, your amp can only provide 50 watts rms. So if you have the volume turned up more than often you may be making your amplifier work too hard and might burn it out eventually. Also when an amp is being pushed to its limits it can sometimes distort or send ''dirty'' power to your speakers.
Good rule of thumb is to have 20-25% more power on the amp so it never has to work maxed out. So if your amp put out 70-80 watts rms it would match a bit better. Having said all this most people run speakers off an aftermet deck, and those have like 14-20 watts rms to each speaker. So you should be ok. Just don't turn the gain knob or boost too high on the amp. And keep an eye on how hot to the touch it gets after using it.
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2011 Kona Blue MT82 V6 Mustang Pony Package 3:31 Gear Ratio, Interior Upgrade Pkg, Security & Shaker500/Sync
Mods (in order of installed): AM Bama SCT SF3 Tuner w/ 87 Hybrid Tune, Airaid CAI, Hurst Billet Plus 2 Short Throw Shifter, Lethal O/R H Pipe w/ Stock Exhaust, Blacked-Out Tints on Rear Windows, Full Ceramic Tint on Front Windows, Metra Touchscreen Dash Adaptor, Single DIN Head Unit, 6.5'' Component Speakers Fronts, Stock Rear Speakers, 10'' Sealed Subwoofer, 4ch. and 1ch Amplifier. LED licence plate lights, LED interior dome lights, FRPP/Dynamic shocks and struts, SR Performance lowering springs, GT500 Strut Mounts, BMR Adjustable Panhard Bar, BMR LCA's, BMR Relocation Brackets. Rear Seat Delete.