NancysToy
Motorbike Professor
There's no question about the effectiveness of the Spyder brakes as designed. The real problem may be your braking technique. Any MSF course will teach you to use both the hand brake and the foot brake when braking. If you have been braking properly all along on your two-wheeler, you will also brake properly on the Spyder, plus you'll even add some "air brake" action while trying to grab the hand brake that isn't there! As you feel the Spyder is unsafe, I must conclude your braking technique could use some improvement regardless of the bike you are riding, as you apparently are not in the habit of using your foot brake at all.
Practice safe braking on the Spyder and the Harley & you'll be much more confident on both.
Alas, the advent of distributed braking systems has instilled some bad habits in way too many riders. The old timers are very much tuned in to the use of both brakes at once for maximum stopping power (and of staying off the front brake in the dirt). Those who have become lazy or learned improperly due to the linked braking systems, are often in the habit of using just the hand or foot, but not both. Remote controls (and highway pegs) have reinforced those bad habits. It is understandable how someone arrives at the conclusion that anything else is unsafe, but in reality it just points out a need for relearning. The real problem here is mainly that old habits die hard.