I love my T5 apart from one thing. I like the fact with the T100 range that you don't need to use switches or dials to use the features. I nearly always get my T5 out of my bag and the dial had been left in position the last time (not too much of a problem as it has a power save feature) but I am cautious about what would happen if I tried to get a voltage reading whilst accidentally set on Ohms for example. And I am unsure if dirt etc can get in behind the dial and cause problems in the future. I still use an old T3 which has no dials etc, gets used daily and it is over 5 years old and still going strong.
The great feature with the T5 is the open jaw current reading option, this is great for fault finding etc.
I have toyed around with getting a T140 for months but still can't bring myself to part with the T5.