Hey Richard. We're fans of GSY. In fact, it was one of the first companies we recommended here at Premium in 2018.
17% annual sales growth and 25% annual earnings growth over the last 5 years, pretty impressive. Also huge beat on earnings estimates last quarter (by 51.2%).
Long term, I wouldn't be disappointed getting into the company. In fact, Mathieu has been a long time shareholder of GSY.
My only concern, and it's much the same as yours, is it has been running up the last while and as a result it's JUST below overbought territory with an RSI of 69.6. Which means there is a possibility (but never a guarantee) we see a short term pullback. Maybe use that to time your entry if you're looking to take a position.
However, using the RSI is frustrating when the company continues to run upwards, and it does happen. It's never 100% accurate in detecting a pullback in an overbought stock or a bounce in an oversold stock.
The choice is ultimately up to you. If you decide to wait for a pullback because of the RSI indicator, you have to be comfortable paying more in the event the pullback doesn't happen.
Cheers
Dan