So a friend sent me a Makala MK-S Uku as a gift. it came with these black nylon strings. I have been lucky enoguh that my other 2 uku's came with Aqullia's. Can someone tell me if the stock strings on these uku's are worth keeping or should I change them, i always hear how changing the strings really changes the sound so I was wondering if I should change them. All opinions welcome.