Brian,
The "Square Deal B" works well for what it is designed to do. The Dillon 650 is an awesome machine compared to what you have been used to using especially if you have ordered the case feeder. Comparing the SDB to the 650 is like the difference between a '73 Chevy Vega and a 2010 Corvette. You may find that you may never use the SDB again after having the 650 for a while. If that's the case then sell it. As you know, the dies on the SDB are proprietary to the SDB only. Changing calibers with the 650 allows you to use any 7/8-14 threaded die sold. Buy a die head for each caliber that you will reload for. The overall size difference between the two is night and day. With the 650 and a case feeder you may find it to rival your height. The 650 also has the ability to load rifle cartridges which was a big downside to the SDB besides that proprietary dies. With that being said;
SUMMARY:
- Hold onto the SDB and see if you continue to use it. If not, sell it.
- The 650 is much more versatile in it's ability to load anything you want.
- The 650 can use any 7/8-14 threaded die.
- With a case feeder, the 650 is going to load so fast it will amaze you and that = more free time to shoot
- The 650 is just awesome to look at compared to the SDB.