A few years ago I switched from M520s to A520s because I was getting (or maybe imagining) a bit of foot burn after about 50 miles. I've not had this problem with the A520s. I think the extra support works (or maybe I'm imaging that as well but I doubt it).
Similar dilemma here regards putting something better than 520's on my bike, been looking at the xt's for around £45 but can't find anywhere with stock
Another A520 user checking in - think they were a good price on CRC & Wiggle. Be aware that eBay sellers often sell them without cleats, whereas they come with cleats from "regular" shops.
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