I was a ketron user for 10 years and had almost all of their boards. The second to last keyboard that I owned was an SD5 and I sold it. Here's why....

1. The weight, very heavy, especially with ketron's black case.
2. The styles are great but, thats it. ketron stop making styles on disk like they use to.
3. It had a few bugs, just like the past models that they never fixed.
4. For the price $2300 base model, no usb, floppy drive, hard disk, vocalizer are options.
5. the riff is nice but boring after awhile since it never changes.

Ketron sounds are in your face great, but the accompanment can become busy.

Now, I sold it for a Yamaha PSR-s900, I love it, its light weight, usb, micro with vocalizer great styles and voices from the T2. The BEST is the price 1599.00 you can't beat that. I accually got at GC center for a 20% off day, so it worked out to be $1280.00. there are some things thatI miss with the SD5, mostly the latin styles, but thats it. Both boards are great they both do the job very well, but one is $800 cheaper without the extra options.

good luck