Pete,
I also started with the Alltec 1/2 day. Everything was fine, however, I had a problem with a suite. Contacted LTT who gave me advice on the phone. Tried their products, which are far superior to that sold by Alltec. Finally I attended 1 of their courses and now feel far better positioned to advise on and clean leather.
I can't comment on others but LTT are superb.
Nigel