All OM-4 models drain the battery even when on 1/60th or switched off. Earlier OM-4 models with the earlier circuit drain more power while late circuit models use less. All OM-4Ti models have the lower power circuit and have a few very small mechanical improvements plus the ability to utilise the F280 full syncro flash. If you have any OM-4 model which you don't intend to use for a while it is best to remove the batteries in any case. This is good practice with any battery dependent camera. One thing I have noticed with the OM-4 compared with the OM-1/2 models is the wind-on feel is slightly less smooth (the earlier cameras are very smooth). The OM-3/4 series were claimed at launch to have a strengthened mechanism and this may be a trade-off between feel and strength of the mechanism. I have used both the OM-4 and OM-4Ti and there is no difference operationally except for the full syncro flash ability on the OM-4Ti. The Ti models tend to sell for quite a bit more money making the original OM-4 a good buy - battery issues aside (just carry spares). One thing which you will not regret buying any OM-4 for is the metering system which is just superb and very simple to use. These are reliable cameras generally and don't suffer from age any worse than comparable models from other manufacturers - I've also used pro-grade Canon and Nikon cameras from the same era. Electronics and general mechanical wear and tear are the prime considerations and if these look fine, then go for it. Just test everything when you get the camera and return if there are any undisclosed problems.