I have an ESII that has "been around the houses" and continues to perform well. The height is IIRC 6mm more than the SP, which seems to bother some people but personally I don't notice it. Obviously there's more in the way of electronics to go wrong than in a SP, but the faster shutter speeds (1/60th to 1/1000th) may all be used independently of the meter, electronics and batteries. As far as I know, the bad reputation for reliability came from the original Electro Spotmatic, but the ES and ESII seemed to have sorted the problems. (I also have examples of the Electro Spotmatic and ES which I acquired u/s but was easily able to sort - the problems were of the broken wire type, not circuitry-related).
Get one and enjoy it!