Donny,
Not that long ago, we had to buy a TOTL arranger to get the great sounds and features we now get on the MOTL arrangers....so we can actually afford a backup without breaking the bank.

I couldn't imagine buying two G70 or two Tyros3 when two PSR-S900s will do the job with room to spare.

The last two TOTL arrangers I had were PSR-8000, and once the PSR-2000 became available, and it easily did everything I needed, then using two MOTL was the way I went from then on.

I won't use MP3 for backup, as it isn't my style, so I need another arranger, and luckily, Yamaha stepped up to the plate and kept giving us home run after home run with superb MOTL arrangers.

Ian