I was very addicted to my KORG TRINITY. When the new TRITON appeared, it was simply too expensive for me to replace TRINITY so for very long time TRITON was on my wish list, but than Korg stopped its production and many years passed by... I got a TR-61 as a second hand machine, which is basically a modernized TRITON-LE - (hopefully) the same TRITON soundbank with a simplified user interface and smaller LCD (non-touch). What I like on the TR after my TRINITY: built in SD-CARD reader. Less weight. More front panel controls for direct access to filters / envelope / and custom programmable knobs. More soundbanks. Trinity-like sounds but with a less SPIRIT in my opinion. What I disslike: the small LCD (go for TRITON EXTREME if you can afford), no ribbon controller, external power supply, the keybed is not as good as it was on TRINITY. For me the arpeggios were useless, also the built in sequencer is a pain to use with such a small display, but its a trade-off for better price. I still like to use it on stage next to my ROLAND FA06 as KORG has its own sound character, which makes it stand off from Rolands and Yamahas. If you like the KORG sound - go for it.
I use the Korg TR 61 as stage piano, what it obviously isn't made for. It was my first synth I ever bought and it has nice e-piano sounds and organs. I never used it as a workstation, what it is meant for in first place. Soon I'm going to change to a more specific stage piano.