I have a 2014 Apollo Evade mountain bike that I have upgraded to ride on the roads for long journeys and commute. This bike now runs like a dream pretty fast for a bike that cost me £120 new plus £30 each for tyres (schwalbe city) and £50 each for lighter sports wheels. I roughly ride about 150 miles a week on average and have completed about 10k miles in 2 years. everyone I have spoken to suggest I should now upgrade to a road bike as it is more suited to my journeys but other than being lighter and quicker, what other advantages are there to me spending 5 times the amount that I have spent on my current bike? And I can cover 20 miles in 1 hour 10 mins on a MTB. And because of my good health and fitness I don't even feel tyred (ha ha) afterwards for riding something that quoted to be slow heavy and supposed to be used on mountains. What do you think is the best option stick with my MTB or go for a massive upgrade to a quality road bike? Please advise.
Salesman: Certainly you should upgrade you bike. You will go faster, further and leap tall buildings in a single bound. Woman will throw themselves at you, men will be intimidated by you masculinity.
Financial Advisor: Buying a bike worth 5 times as much to do the same job your current bike does is not a prudent financial investment. You should stick to the bike you have that is working perfectly well for you.
I cannot tell you who to listen to. What I will say is £120 is a pretty cheap bike (BSO) and it would almost certainly be better to spend money on a better bike than upgrading it further. If you are happy with your current bike, I suggest start saving for a new one then ride the old one until buying a new bike is less about worry about what it costs and more about looking forward to riding a better bike.
If it ain't broke, don't fix it!
While the bike works and suits your usage, keep using it. Keep in mind that a cheap bike (which 120 pounds for an MTB certainly is) will need more service to keep it safe and functional. You'll likely want to upgrade once you start to wear it out. You'll have a better idea what to look for and (if you start saving now) a bit more money.
What that next bike should be like is up to you, but for commuting and longer trips I'd go for a touring bike - a rack and fenders make the bike way more comfortable to use and it will still end up faster than an equivalent MTB.
Also, don't buy a bike you cannot afford have stolen and get a good lock (10% of the price of the bike is recommended).
I would advise sticking with the mountain bike. I commute on one and a tourer which is basically the same thing but with road wheels.
I tried a road bike a couple of times, and it's not as comfortable and didn't seem all that much faster. And I just need a workhorse to get me from A to B, so comfort is a bigger factor than speed, I'm not racing anyone and I believe that I get just as much exercise as from a road bike if not more.
This forum is like a bike calculator. My own terminology, but what I mean is that most of the regular contributors in this forum answer based on facts and calculations using their brain, not based on emotion and fashion. Whilst they are a very knowledgeable bunch, I feel like some of us are more keen to...ahem... splash the cash, splosh the dosh, blow the dough, spray some pay, or at least to buy things that are "nicer" rather than just being more functional and cost effective.
I however am severely materialistic, and I like to look downright peng when on my bike. So I would advise that if/when you can afford it, without it negatively impacting other important aspects of your life, then why not treat yourself to something a little tastier. You might be fast on your current set up, but you will be faster on a lighter, stiffer, more aero and potentially more suitably geared road bike, that's not an opinion it's the laws of physics. Maybe you aren't interested in going faster or in going the same speed for less effort, in which case you have very little to gain from getting a better bike, but c'mon? really?