Road Bike or Mountain 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.