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I have a couple of issues with integrated. Lamp quality, especially CRI values can be poor and when you need to replace one it might be years from now and the exact replacement won't be available.
If you get the holders and lamps separately you can choose to have a reasonable quality box of GU10 from Amazon for £15 or Phillips Master for £6 each.
If you have a dimmer on the circuit and you convert all the lamps to LED you will need to change the dimmer too.
I bought a whole bunch of shelves for a fairly reasonable price from Moderix. Reclaimed wood so it has a rustic feel (some boards arrived warped etc) and if you want it completely level may not be the best, but it does the job for not too much money..
@Airhead cheers - will go monkey with the transformer and look to maybe changing out to integrated LEDs as @NotThamesWater has suggested..