hi, i haven´t heard much about or tried trim spa, but i currently use a product called Therma Pro, which unfortunately has been discontinued. i´ll be trying a replacement soon. basically, my opinion is, anything with sida cordifolia (an extract of ephedra) and guarana, caffeine, and aspirin, is VERY effective..in every sense of the word. theres alot of bad publicity about ephedra but one has to make up their own mind. for me, it: boosts my metabolism (or is thermogenic...whatever), makes me HAPPY, gives me a buzz, helps with weight loss....but most of all....it gives me SO much energy, and not just the jitters. if you wanted to try an alternative, i´d personally suggest something with the above ingredients, though i´m no expert and haven´t tried many other products. there are alot of good products out there. i guess a bit of trial and errror is to be expected.*