Cypher will that help you at all late game either. W00t 750 health... then UB uses spit w00t you die anyway.
This potion comment is not really a good idea imo, since beyond level 7 or so nukes can really hit you hard.
I made the "potion comment" assuming that we were all talking about lower levels, since if you had already been killed plenty of times by getting chased down during the early stages of the game, and your opponent had taken advantage of all the gold and xp that he/she had earned from killing you early-on, you would stand no chance in your high levels, cuz your opponent would already be much stronger then you from said gold and xp, and all you'd have left to do is watch your citadel fall down.
The "potion comment" was merely a suggested solution to the problem of dying early-on in the game (say...levels 1-5/6/7). If you take your potion in those early levels, and your opponent is still in his early levels, he will most likely not have enough health to finish you off in time before the towers/you kill him. That's just the way it usually goes early on in the game...everyone doesn't have nearly the amount of health they will later on, and the towers are actually a threat, instead of a minor hinderance, as is the case in the later stages of the game. If YOU are the one finishing-off your opponent early on in the game and bringing in heaps of gold and xp as a result of your kills, then YOU will be the one with the advantage later on in the game, and your opponent will find himself/herself in a fair bit of trouble. Your opponent was the one who chose to use the high-risk "tactic" of chasing you into your towers early-on in the game, and since you hopefully were prepared for it (with Potions/Sigils/etc.), he's the one that payed for it.
And sure, even if you take some potions/sigils with you early game and use them in your towers when you're being chased, it isn't gonna guarantee a kill. Especially if you're against an Oak with Shield or a Sedna with Heal. But what it will most likely guarantee is that your opponent will recognize that if he/she continues to try and get you, it'll be way too risky of a chase, and if they're smart, they'll back-off and rush back out of the towers. You didn't get a kill, but look on the bright side...you didn't die either. No gold or xp for them. You have a much better chance later on in the game.
If you stop runnin for a mere potion you may very well get killed for stopping. Therefore stopping may not be the most wise thing you can do. At low level however it may be viable.
Yes, it can be risky, but if your health isn't in too bad of situation yet, you can devastate your opponent by stopping to hit the potion button in just the right place. Say, right by several Towers of Light/Darkness, and an Archer Tower or two. Early-on in the game, those things can seriously kick your ass if you're not careful, and this "tactic" of chasing somebody into their base early-on in the game is practically the definition of "not careful". If you've hit that potion right by your towers, and your opponent hasn't yet clicked somewhere outside your base to escape, use your health boost and the towers that are completely surrounding your opponent to YOUR advantage. Several towers, combined with you pounding on your opponent as he tries to flee, equals massive amounts of DPS and, most likely, a kill for you. Which also means more gold/xp for...YOU.
And, yes, I'm still referring to early levels. If you've already been decimated in your early levels by your opponent, then their is pretty much nothing you can do. He/She just has way to much gold and xp from killing you. My suggestions are just some ways in which you can prevent your opponent from grabbing that early-game advantage, that would end-up devastating you in the later parts of the game.
if you are fighting a compitent opponent does it matter if you have a potion or not.
A competent opponent will not be seen using this tactic of chasing you into your base early game...ever. The potions are for those opponents who are very reckless in the early parts of the game and are trying to "kamikaze" you for gold and xp. If you are prepared (with a potion or a sigil), then they just completely failed their kamikaze. If you aren't prepared for this reckless attack...well, then you really don't qualify as a competent opponent to them either.
Oh, and since you feel like playing the role of grammar police in this thread...you spelled "competent" wrong.