With perhaps creatine, beta alanine has a ton of science to back it up. Think of it this way, it will help buffer lactic acid in my oppionion better then creatine. What this means if you were about to finish a set at say rep 5 you might now get 6-8. Big difference.
Word of warning you will get a tingling sensation in the early days that you use it in your skin. Almost like wearing a wool sweater without a shirt. It will go away. Beta alanine is mighty good stuff.
I've used it and not used it doing 4 hour cardio sessions when I was a long distance runner. I noticed a substantial reduction in muscle fatigue during sessions I used the beta alanine. It made training for longer periods far easier.
With weight training, I notice it most during high rep raise sets (anterior, lateral, and rear). It allows for more reps with a noticeable reduction of *burn*
thats weird that you mention laterals because thats one exercise that exploded in my capability to do higher reps. I could do like 12 reps at a certain weight with beta alanine I could pound out like 20 reps. It brings back the weird tingly sensation and chemical taste in my mouth thinking about it.
One of the few supplements I do notice if I drop or not... good stuff to me but it won't blow you away.
When I'm on my game I take 2 of TP's caps every few hours on training days leading up to the session and possibly a double dosage 30-45 minutes prior if I haven't taken in a several dosages prior for a total of 6 during the day. Off days are generally 4 caps.
I do get the tingles especially on my ears and back, like I cut my hair and some of the clippings found their way under my shirt haha.