@amwjoe we use MX355-24X and 48X (not X2) in our datacentres. They have been very reliable and performant, though we aren't running storage (iSCSI or FCoE) protocols on them. If your servers have 10Gb RJ-45 sockets on them I would go with the MS355s, but if your servers have SFP+ ports on them then the MS425 with DACs might be a better bet. I say this as we have had variable results with 10Gb RJ-45 adapters in SFP+ ports on servers. Sometimes they work like a dream for years, other times they are constantly troublesome, same server models and transceiver models...
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